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How does pressure vary with depth

Variation of Pressure with Depth in a Fluid Physic

At the Earth's surface, the air pressure exerted on you is a result of the weight of air above you. This pressure is reduced as you climb up in altitude and the weight of air above you decreases. Under water, the pressure exerted on you increases with increasing depth If we take P 1 to be the pressure at the surface of the water, then it is equal to the atmospheric pressure: P 1 = P atm and y 1 = 0. If we make P 2 to be the pressure at a depth of h below the surface, then:. P 2 = P and y 2 = -h. The bold equation from above thus gives us the following formula: P = P atm + r gh. As this fomula shows, P increases with depth, h, in the fluid In liquids, pressure varies with depth. increases, the pressure applied by the liquid also increases. This can be related using a formula: Pressure in liquids= density*height*gravitational pull

What do you suppose is the total pressure at a depth of 10.3 m in a swimming pool? Does the atmospheric pressure on the water's surface affect the pressure below? The answer is yes. This seems only logical, since both the water's weight and the atmosphere's weight must be supported. So the total pressure at a depth of 10.3 m is 2 at Pt = Pm + Pa. where Pt is the total pressure, Pm is the pressure due to the mercury, and Pa is the pressure due to the air. To find the total pressure on something submerged in a liquid, you have to add the pressure due to the liquid to the atmospheric pressure, which is about 14.7 pounds per square inch, or 1.013 × 10 5 pascals seawater pressure change with depth In vacuum condition (patm=0 bar v) the absolute pressure will be equal to the gauge pressure. The density of the sea water changes most importantly by salinity, pressure and temperature: As the temperature increase so the density of the water will decrease as the fluid will expand with temperature

Answer The pressure exerted by a liquid increases with depth. This is due to an increase in hydrostatic pressure, the force per unit area exerted by a liquid on an object. As you go deeper, the area of liquid exerting pressure increase thus it also increases the pressure The pressure will vary only with the depth of the container, and nothing else, if the same liquid is filled in the container. if p and g are same, the only factor effecting the pressure is h. The answer is option(A). is depth . Explanation: the answer is depth . farooqisamar2 farooqisamar A slightly different way of explaining the pressure is to recognise that gravity is directed to the centre core of the planet, Earth. The deeper the vertical distance to the core the greater is the load and, therefore, the pressure due to matter making up the composition of the planet, which includes the molten liquid layers Pressure INCREASES at ocean depth. And this is certainly an issue for scuba divers... At the surface they are breathing gas at 1 ⋅ atm pressure... At a depth of 10⋅ m they breathe air at 2 ⋅ atm...and at 20 ⋅ m they breath at 3 ⋅ atm Vertical pressure variation is the variation in pressure as a function of elevation.Depending on the fluid in question and the context being referred to, it may also vary significantly in dimensions perpendicular to elevation as well, and these variations have relevance in the context of pressure gradient force and its effects. However, the vertical variation is especially significant, as it.

11.4 Variation of Pressure with Depth in a Fluid - College ..

Pressure changes with water depth. In this activity you will investigate the relationship between pressure and depth. You will use a clear plastic bottle, scissors and duct tape. This is a simple activity suitable for Key stage 2-3, grades 5-8 and ages 10-14 Viewed 10k times. 9. I've learned in school that pressure in water changes like. p ( h) = ρ g h. where h is depth in meters, ρ is density (e.g. 1000 kg m 3 for water) and g is gravitation acceleration ( ≈ 9.81 m s 2) and p is the pressure in Pascal. I guess there is no similar law for pressure in earth as it is to different, depending on. Subduction zone geochemistry chapter 2 earth materials the story earth s interior mega packet mc pare how pressure and temperature direct indirect sources for Pare How Pressure And Temperature Change With Depth Inside Earth BrainlyWhat Causes The Pressure To Increase As You Go Deeper Below Crust QuoraGeos 306 Lecture 13 Mineralogy Of The Earth An

This video explains how liquid pressure changes with depth. Thank you to those who fund me via https://www.patreon.com/kisemboacademy . you make it possible. Hydrostatic pressure increases in proportion to depth measured from the surface because of the increasing weight of fluid exerting downward force from above. If a fluid is within a container then the depth of an object placed in that fluid can be measured. The deeper the object is placed in the fluid, the more pressure it experiences Calculator. This calculator determines the water depth to reach a given pressure or the pressure at a given depth. You can enter the depth or pressure input with most common units and it will be converted automatically. This calculator does not add air pressure at the surface - the results are relative to the surface pressure The pressure in a liquid is different at different depths. Pressure increases as the depth increases. The pressure in a liquid is due to the weight of the column of water above. Since the particles.. For every additional 10 meters deeper you dive, the pressure on your body increases by 1 bar. As you can see from the table below, our bodies are subject to 3 bars or atmospheres of pressure at a depth of 20 meters and 4 bar/atm at 30m. Depth. Bar/atmospheres (ATM) of pressure. Volume of air in our bodies How Does Pressure Change with Depth? - Saint Mary's

• Hello! The answer revolves around the basic physics of atmospheric pressure. If you consider you being at the depths of the ocean or waterI could say at the Earth's surface, the air pressure exerted on you is a result of the weight of air above y..
• g pool, is shown by the equation: P = gh, where P is the water pressure g is the acceleration due to gravity h is the depth of the water at that poin
• Why does pressure vary with depth in a fluid at microscopic level? Ask Question Asked 1 year, 6 months ago. Active 1 year, 6 months ago. to a vehicle moving approximately on a iso-density surface but not in the direction perpendicular to it as the pressure will vary greatly!).
• A column of water 10 meters thick exerts the same amount of pressure as the entire Earth's atmosphere (which is 80 miles thick!). That means if a diver descends just 10 meters underwater, he would experience the pressure of two atmospheres pressing down on every part of his body
• Oceanographers usually measure underwater pressure in decibars (dbar) because pressure in the ocean increases by approximately one decibar per metre depth. The standard atmosphere (atm) is an established constant. It is approximately equal to typical air pressure at Earth mean sea level and is defined as 101 325 Pa

How does pressure vary with depth? - Answer

• A variation up to almost 0.6 GPa in pressure at 2500 km depth is obtained when varying the mantle potential temperature of ±100 K (Figure 1, left). Finally, redefining the density distribution with its appropriate pressure profile, increases the total mass of around 0.16% in the reference case
• e the mechanical advantage in a U-shaped tube. He also explains pressure and Pascal's Principal. Created by S..
• How does the pressure in liquids change with depth? - 17368161 sarthak8583 sarthak8583 12.05.2020 Physics But as we go we deeper in a liquid the pressure of liquid increases.As the depth of liquid increases the weight of liquid column pushing down from above increases and hence the pressure also increases
1. The reason for the increased pressure is that the deeper into a fluid you go, the more fluid, and thus the more weight, you have over top of you. We can calculate the variation of pressure with depth by considering a volume of fluid of height h and cross-sectional area A (see Fig. 9.3)
2. This relationship between pressure and depth may be looked at with respect to the relationship between pressure and volume, as the column of water has a specific volume and corresponding to depth. Boyle's Law describes the relationship between pressure and volume: The product of pressure and volume is a constant (PV=k)
3. The pressure in any body of fluid varies with depth and it increases with the depth of the fluid. But at the same level relative to the vertical direction the pressure will be same in the fluid. The increase in pressure as we go down the fluid is due to the weight of the fluid column above that level
4. Correct answers: 2, question: How does pressure vary with depth
5. Answered 2011-09-14 01:19:55. pressure AND temperature increase as you go deeper into the earth's crust. pressure: because more and more weight is being forced downward. temperature: because the.
6. Why does pressure vary with depth in a fluid at microscopic level? 2. Why is pressure on object in fluid dependent on height of water column above it whereas the *force* on object is not? 0. Calculating the pressure on the bottom of an object submerged in a fluid, how come it only depends on three variables? 0

How Changing Depth Affects Pressure - dummie

1. imal, 2% or less - IME)
2. How does pressure change with ocean depth? 1 See answer caitlinturosky is waiting for your help. Add your answer and earn points. FuturePresident2040 FuturePresident2040 The pressure changes because as you go deeper more water is pushing you down and all around you. It is the exact opposite of Outer Space because in the ocean if you go to deep.
3. How does pressure change underwater and how do pressure changes affect aspects of scuba diving such as equalization, buoyancy, bottom time, and the risk of decompression sickness?Review the fundamentals of pressure and scuba diving, and discover a concept no one told us during our open water course: that pressure changes more rapidly the closer a diver is to the surface
4. The other thing they learned was that when you're way down deep underwater, the water pressure is the same on all sides of the submarine. (in other words, the water pushes just as hard on the top of the sub as it does on the bottom or the sides.) So the best shape for the sub to be is one that's the same everywhere, a circle
5. The pressure increases about one atmosphere for every 10 meters of water depth. At a depth of 5,000 meters the pressure will be approximately 500 atmospheres or 500 times greater than the pressure at sea level. That's a lot of pressure. Research equipment must be designed to deal with the enormous pressures encountered in the depths

In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus a column of fluid, or an object submerged in the fluid, experiences greater pressure at the bottom of the column than at the top. This difference in pressure results in a net force that tends to accelerate an object upwards Water pressure. Water is about 1000 times heavier than air, and so 1 litre of water has a mass of 1kg and a volume of 1000cm³. Again, if we produce a column 10m high and 1cm² area, we will create a water pressure of 1kg/cm² at the bottom (1kg/cm² = 1bar). The pressure in water increases by 1bar for every 10m depth Pressure At Depth Calculator - Hydrostatic Pressur

g is the gravitational acceleration. h is the depth below the surface of the fluid. As we see from the equation, the pressure is directly proportional to h, the depth below the fluid surface: therefore, as h increases, the pressure increases as well. 1jaiz4 and 3 more users found this answer helpful. heart outlined How does the fluid pressure vary with depth? Identify the right answer. It remains constant Varies linearly Varies in a quadratic manner None of the above is true since it depends on the fluid densit The average pressure p due to the weight of the water is the pressure at the average depth h of 40.0 m, since pressure increases linearly with depth. The force exerted on the dam by the water is the average pressure times the area of contact, [latex] F=pA. [/latex] solutio

How does the pressure extend by a liquid change with the

• Thus, the overburden pressure is equal to the grain-to-grain lithostatic pressure plus the fluid pressure of the porous formation times the depth, yielding an average overburden pressure gradient of 22.7 kPa per meter of depth (1.0 psi/ft) which corresponds to an overall bulk specific gravity of the rocks plus the interstitial fluids equal to 2.
• The local pressure will increase with an increase in depth due to the extra weight of water column above that point.) 1. In a stationary fluid, how does the local pressure of the fluid vary
• In reality, buoyancy does vary due to the following effects: If the object is compressible then its volume V will reduce with depth, due to the increasing pressure. The water density ρ can vary with position, due to the compressibility of the water or from temperature or salinity variations. Normally the density increases with depth, since.
• 14.1.2 Effects of water depth on reservoir fracture pressure. Reservoir fracture pressure is a function of both overburden pressure and reservoir pressure. As water depth increases, the effective overburden (as measured from the rig floor) decreases, and so the pressure required to fracture the formation is less in relation to well depth

Geostatic gradient is the rate of change of geostatic pressure with depth. A geostatic gradient of 1 psi/ft results from an average density of 2.3 g/cm 3. How geostatic gradient varies. Geostatic gradients vary with depth and location. The gradient increases with depth for two reasons: Rock bulk density increases with increasing compaction As the depth of liquid increases the sideways pressure on the walls of the vessel gradually increases and it becomes maximum near the bottom of the vessel. The wall of a dam is made thicker at the bottom so as to tolerate very high sideways pressure exerted by deep water stored in the reservoir of dam The pressure at depth D1in the water is the weight of the overlying atmosphere plus the weight of a column of water, per unit area. At depth D1, the pressure P1 is uniform everywhere at that depth in the water, and the force pushing up on the block is the pressure×area of the block = ρw ×g×A×D1, since pressure P1 = ρw ×g ×D1. P1A=A105 + � Pressure Effects. As pressure increases, so does water density. The water molecules pack together tighter as pressure increases -the pressure increase with depth, due to the weight of the water above, and causes the greatest density changes in seawater with depth (greater than the density changes due to temperature and salinity changes)

1. How does pressure due to a liquid held in a container ..

1. The pressure at a depth in a fluid of constant density is equal to the pressure of the atmosphere plus the pressure due to the weight of the fluid, or. p = p 0 + ρ h g, p = p 0 + ρ h g, 14.4. Where p is the pressure at a particular depth, p 0. p 0 is the pressure of the atmosphere, ρ
2. The average pressure p due to the weight of the water is the pressure at the average depth h of 40.0 m, since pressure increases linearly with depth. The force exerted on the dam by the water is the average pressure times the area of contact, solutio
3. How Does Pressure Affect Buoyant Force?. Pressure, which is a force exerted upon an object over a given area of space, affects buoyancy when the object is submerged. An object submerged in water will experience a buoyant force equal to the weight of the water that is being displaced by the submersion. In other words,.
4. The pressure from the weight of a column of liquid of area A and height h is . The most remarkable thing about this expression is what it does not include. The fluid pressure at a given depth does not depend upon the total mass or total volume of the liquid
5. At high latitudes, ocean waters receive less sunlight - the poles receive only 40 percent of the heat that the equator does. These variations in solar energy mean that the ocean surface can vary in temperature from a warm 30°C (86°F) in the tropics to a very cold -2°C (28°F) near the poles
6. Question: How does the pressure exerted by a liquid change with depth? Explain with a diagram. Answer: Take a plastic container and make four holes in it at different heights. Fill the container with water, and let water keep flowing into it from a tap. Notice the force with which water comes out of the holes
7. The deeper you swim, the greater the pressure. The cause of pressure is simply the weight of the water (and air) above pushing against you. If you swim twice as deep, there is twice the weight of water above, and twice the water pressure. The pressure exerted by the liquid depends on density as well as depth

Why do the pressure and temperature keep on increasing

1. How does water pressure change with depth? How is pressure distributed at a given level in a fluid? Pressure in Fluids. Water pressure increases as depth increases. The pressure in a fluid at any given depth is constant, and it is exerted equally in all directions
2. Question: How Does The Pressure Exerted By A Liquid Change With The Depth Of The Liquid?How Does The Pressure Exerted By A Liquid Change As The Density Of The Liquid Changes?Discounting The Pressure Of The Atmosphere, If You Swim Twice As Deep In Water, How Much More Water Pressure Is Exerted On Your Ears?In A Deep Dive, A Whale Is Appreciably Compressed By The.
3. The average pressure due to the weight of a fluid is. (14.3.4) p = h ρ g. Entering the density of water from Table 14.1 and taking h to be the average depth of 40.0 m, we obtain. p = ( 40.0 m) ( 10 3 k g / m 3) ( 9.80 m / s 2) = 3.92 × 10 5 N / m 2 = 392 k P a. We have already found the value for p
4. How Does Pressure Affect Density? Pressure and density are directly in compressible materials. As the isostatic pressure applied on a material increases, the material density increases as the atoms or molecules of the material are pushed more closely together. Density is defined as the mass per unit volume Hydrostatic Pressure vs Depth Liquid Table Chart. Hydrostatic pressure is the pressure exerted by a fluid at equilibrium at a given point within the fluid, due to the force of gravity. Hydrostatic pressure increases in proportion to depth measured from the surface because of the increasing weight of fluid exerting downward force from above Example: Does gage pressure change with elevation? Solution: No. Since gage pressure is always relative to the local value of atmospheric pressure, the gage pressure of the atmosphere is always zero, regardless of elevation. Note that absolute pressure decreases with elevation, just as water pressure increases with depth Pressure in the Deep. Everything in the deep ocean is under a great deal of pressure. At any depth in the ocean, the weight of the water above pushes on any object below it. With every foot an object descends into the ocean, more water is pushing down and against it, and more pressure is exerted upon that object

Pressure gauges operate on the principle that a small coil of wire or tube of fluid will compress or change shape depending on the external pressure exerted on that gauge. In the ocean, pressure and depth are directly related, so the amount of pressure being exerted on the gauge can be used to determine the depth of the reading This shows that pressure increases with the depth of a liquid. If you bend the rubber tube so that the face of the funnel is vertical, as shown in Figure 8.13 (d), and rotate it at the same level of water, the pressure indicated by your manometer will remain steady. This shows that at a given depth the pressure in a liquid is the same in all. As the depth increases, the water temperature gets colder and colder until it reaches a nearly constant value of about 2°C for depths below roughly 1000 m. Where temperature is nearly constant, the pressure of the water has the largest effect on sound speed. Because pressure increases with depth, sound speed increases with depth

How does atmospheric pressure change with depth? Socrati

1. The bottom of the object i.e. the part which is at a greater depth, will also feel a greater pressue, and so the difference in pressure causes an upward force on the object called the buoyant force. But this difference in pressure never changes, because the size of the object does not change, and each meter of depth adds the same 1.4 psi
2. As you head toward the center of the Earth, temperatures increase exponentially. The Earth's core is a sphere of molten nickel and iron. Now just think about how hot it has to be to melt iron, let alone for the iron to remain melted. The center of the Earth is almost as hot as the surface of the sun as new studies show, a blistering 10800 degrees Fahrenheit, approximately 5982 degrees Celsius
3. Variation of Pressure with Depth One might guess that the deeper you go into a liquid or gas, the greater the pressure on you from the surrounding fluid will be. The reason for the increased pressure is that the deeper into a fluid you go, the more fluid, and thus the more weight, you have over top of you
4. pressure vary with depth as shown in the following graphs found in Tromp (2001): Our linear approximation predicts a pressure of 54 GPa at a depth of 2000 km, whereas the model shown in the graph predicts a pressure of 87 GPa at that depth
5. The Pressure in a homogenous, incompressible fluid at rest depends on the depth of For incompressible, the pressure will vary linearly with depth the fluid relative to some reference and is not influenced by the shape of the container. p = p o p = p 1 p = p 2 Lines of constant Pressure For p 2 = p = γh + p o h1 For p 1 = p = γh 1 + p

It will unquestionably raise the pressure, but in my experience with 300 WM and 270 Win, 0.05 shorter probably didn't even equal 0.1 gr more powder. For example, 0.1 seating depth in my 300 WM was 10-15 fps, and only obvious with lots of shots and long term averages Variation of g with depth | How does Acceleration due to gravity(g) change with depth? Variation of g with depth: As depth d increases below the earth's surface the value of acceleration due to gravity falls. This is expressed by the formula g2 = g (1 - d/R). Here g2 is the acceleration due to gravity at depth d with respect to the earth's surface and R is the radius of the earth Seating deeper causes a pressure increase due to reduced case capacity. Seating longer to touch the lands creates a pressure increase because the bullet doesn't have a running start into the lands. This is why tuning a load can be a vicious cycle. Say you do a ladder test to find the 'sweet spot' for bullet seating depth at 1K yards For example, if air pressure measures 840 mb at an elevation of 1,000 meters above sea level, the measurement adjusted for sea level is 1,020 mb. Without correcting for air pressure at sea level, the air pressure on the top of Mt. Everest is near 300 mb If the submarine goes underwater, the amount of air within it does not change (unless there is a leak, of course), so the pressure within the sub remains the same. The pressure outside the sub, however, is determined by the depth

This is the reason water pressure increases with depth. The pressure depends only upon the depth, and is the same anywhere at a given depth and in every direction. Units of Pressure. Pressure is measured in units of force (such as pounds, lb.) divided by area (square inches, in 2). Other ways of measuring pressure are also common Figure 5-5. A uniform open-channel flow: the depth and the velocity profile is the same at all sections along the flow. 12 One kind of problem that is associated with uniform flow is what the channel slope will be if discharge Q, water depth d, and bed sediment size D are specified or imposed upon the flow Effects Of Cartridge Over All Length (COAL) And Cartridge Base To Ogive (CBTO) - Part 1 by Bryan Litz for Berger Bullets. Many shooters are not aware of the dramatic effects that bullet seating depth can have on the pressure and velocity generated by a rifle cartridge. Cartridge Overall Length (COAL) is also a variable that can be used to fine-tune accuracy Pressure exerted by liquid vary with depth only ,it is same in all direction, Liquid pressure = weight density x depth. So,more the depth more will be the pressure Definition. The hydrostatic pressure gradient is the rate of change in formation fluid pressure with depth. Fluid density is the controlling factor in the normal hydrostatic gradient. In the U.S. Rocky Mountains, a formation water gradient of 0.45 psi/ft is common

How does pressure change with depth? STEAM Activity

The field of pore pressure analysis is the study of how pressures within rock pores vary with depth inside the subsurface. In the field of exploration, pore pressure holds particular significance for drilling and discovery purposes. Modern drilling teams often need a subsurface pore pressure map in order to drill safely and efficiently Recreational scuba divers adhering to the dive tables have no significant risk of oxygen toxicity. At 35 feet depth, where RSD tables allow the diver to spend well over two hours on a non-repetitive dive, the PAO2 (oxygen pressure in the lungs) is the same as from breathing 43% oxygen at sea level, i.e., non-toxic. At the maximum RSD depth of 130 feet, the PAO2 from breathing compressed air is. In most hydrocarbon-producing areas, the gradient is usually in the range of 0.6 to 1.6°F per 100 ft of depth increase (Fig. 3). Areas where the earth's crust is thinner than average, such as volcanic and geothermal areas, have much higher gradients. In thin-crust areas the gradient change averages 4°F per 100 ft of depth increase civil engineering - How does pressure change with depth in

Swells are deep-water waves, meaning that the depth (D) of the water is greater than half the wave's wavelength (D > 1/2 L). The energy of a deep-water wave does not touch the bottom in the open water (Fig. 4.18 A). When deep-water waves move into shallow water, they change into breaking waves Pressure at a depth in a fluid. Finding height of fluid in a barometer let's say it's not a glass let's say it's a rubber sphere if I were to change the shape of that sphere but not really change the shape of that of the volume and if I were to change the shape of the sphere where it looks like this now the water would just change its shape. Figure 1 shows the variation of pressure with depth for the three temperature gradient models given by α = 10, 30 and 50 K/km. In all three models, the pressure increased rapidly with depth reaching values of 1.48, 1.42 and 1.38 times the surface pressure at 3.5 km. The highest magnitudes of pressure wer

How Does The Temperature And Pressure Change With

While sound moves at a much faster speed in the water than in air, the distance that sound waves travel is primarily dependent upon ocean temperature and pressure.While pressure continues to increase as ocean depth increases, the temperature of the ocean only decreases up to a certain point, after which it remains relatively stable i.e. related to depth z. The unit weight, , will vary with the water content of the soil. If both total stress and pore pressure change by the same amount, the effective stress remains constant. A change in effective stress will cause: a change in strength and a change in volume

How does liquid pressure change with depth- Kisembo

The actual amount of dissolved oxygen (in mg/L) will vary depending on temperature, pressure and salinity ¹. First, the solubility of oxygen decreases as temperature increases ¹. This means that warmer surface water requires less dissolved oxygen to reach 100% air saturation than does deeper, cooler water The depth at which this pressure is encountered becomes the deepest liner depth. The establishment of a setting depth between the shallowest and deep depths generally depends on operator preference and the geological conditions. Example 2. Use Fig. 3 to select liner and intermediate setting depths. Assume a differential-pressure limit of 2,200 psi The difference in level due to a 20degC change would be approximately 0.2% without any change in pressure. This does not seem much but when you consider that many pressure sensors can measure to a better precision than 0.25% of full scale a 0.2% change in water density is quite significant

What is Hydrostatic Pressure -- Fluid Pressure and Dept

How does oceanic temperature vary with depth the temperature decreases with from ATMS 100 at University of Illinois, Urbana Champaig MCQ Questions for Class 8 Science: Ch 11 Force and Pressure. 1. Force acting on per unit area is called. 2. The strength of a force is usually expressed by its. 3. When two forces act in opposite directions, then net force acting is the. 4 How does the water pressure change at different depths? How can we reduce or increase water pressure? Can we use water pressure to do something, such as lifting a car, breaking a tree, or digging into the ground? Any of these questions can be the subject of a science project. Project description:. Density and change in Pressure. The influence of pressure on the volume of a liquid can be expressed with the three dimensional Hooke's law. E = - dp / (dV / V 0) = - (p 1 - p 0) / ((V 1 - V 0) / V 0) (5) where . E = bulk modulus - liquid elasticity (N/m 2) The minus sign corresponds to the fact that an increase in the pressure leads to a.  Ambient pressure is determined solely by depth, and is the pressure inside the diver's lungs when breathing with scuba equipment. Tank pressures for a given depth will vary depending on the rate of air consumption and duration of the dive; at each depth in this table a tank psi of 1500 is shown as example Partial Pressure Applied to Scuba Diving . An easy way to think of partial pressure in scuba diving is to consider it a measurement of the concentration of a particular gas in a diver's mixture of breathing gasses. As the concentration of a particular gas in a diver's breathing gas mixture increases, the physiological and psychological effects of that gas may increase or change A stronger heart can pump more blood with less effort. As a result, the force on your arteries decreases, lowering your blood pressure. Blood pressure is measured in millimeters of mercury (mm Hg). Normal blood pressure is less than 120 mm Hg for the top number (systolic) and less than 80 mm Hg for the bottom number (diastolic)