Glossary pressure the weight of the fluid divided by the area supporting it Supporting it (the area of the bottom of the container): We shall see in Pascal’s Principle that fluid pressures always add in this way. So the total pressure at a depth of 10.3 m is 2 atm-half from the water above and half from the air above. This seems only logical, since both the water’s weight and the atmosphere’s weight must be supported. 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. Since water is nearly incompressible, we can neglect any change in its density over this depth. Just 10.3 m of water creates the same pressure as 120 km of air. That pressure is the weight of the fluid mg size 12 Let us calculate the pressure exerted on the bottom by the weight of the fluid. Its bottom supports the weight of the fluid in it. The difference is that water is much denser than air, about 775 times as dense.Ĭonsider the container in. You may notice an air pressure change on an elevator ride that transports you many stories, but you need only dive a meter or so below the surface of a pool to feel a pressure increase. In this case, the pressure being exerted upon you is a result of both the weight of water above you and that of the atmosphere above you. Under water, the pressure exerted on you increases with increasing depth. This pressure is reduced as you climb up in altitude and the weight of air above you decreases. At the Earth’s surface, the air pressure exerted on you is a result of the weight of air above you. If your ears have ever popped on a plane flight or ached during a deep dive in a swimming pool, you have experienced the effect of depth on pressure in a fluid. Calculate density given pressure and altitude.Explain the variation of pressure with depth in a fluid.
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