give common examples of- 'air exerts pressure'?
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Get a clean 1 or 2 gallon metal container with a screw top cap. Put an ounce or two of hot water in it and place in hot sun without cap!\n\nPut the cap on tight and immediately place in a very cool area. Soon the metal container will be crushed because the hot water vapor created by the container being in the hot sun will condense back into liquid  leaving a partial vacuum in the sealed metal container. \n\nThe weight of the air outside the sealed container will crush it inwards.\n\nIf you do this please be careful!
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Three examples off the top of my head:\n\n1. Thermometers.  As the temperature increases the liquid inside the thermometer expands to indicate a change in temperature.\n\n2. Fire protection sprinklers.  Look at the sprinklers you find in many public buildings.  The piping that runs to the sprinklers is usually filled with water, but are capped off at the sprinkler head.  On many sprinklers, above the cap is a small glass vial containing a liquid that will expand when heated (say, in a fire).  When the liquid expands, the increased pressure fractures the glass vial which releases the cap and allows water to flow from the sprinkler head.\n\n3. Fire suppression.  One primary reason that water is used to extinguish fires (especially in enclosed areas) is because water, when converted to steam, expands 1700 times.  Therefore, a small amount of water applied to a fire becomes a HUGE amount of steam, which forces the atmospheric air (and oxygen) out of the area and chokes the fire.
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Water pressure is the pressure that water exerts on any object that is immersed in it. Picture holding an object over your head the object is exerting a force on you. In the same way water exerts a force on you if you in a pool, but a force on all parts of your body. Atmospheric pressure is similar to water pressure but it is force exerted by the air around us.
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Particles of warm air are more spread out resulting in less pressure.  Cold air particles are closer together resulting in a higher pressure.  Since air wants to move from an area of high pressure to an area of low pressure, cold air moves toward the lower pressure of warm air.
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Pascal's principle : Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container.  \nAn example: hydraulic lift.
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to reduce air pressure sudden surge
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Atmospheric pressure and physics
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Wikipedia of course\nhttp://en.wikipedia.org/wiki/Air
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air resistance.\n\n Do the experiment yourself- if at school- get a teacher to make up a sealed tube, suck out the air (less difficult than it sounds- i remember doing something like this) and then invert it. its very strange.
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The process of respiration involves two major processes: inspiration and expiration. \nDuring inspiration, the inspiratory muscles contract, the diaphragm descends, and the rib cage rises. The thoracic cavity volume increases, stretching the lungs, and the intrapulmonary volume increases. This causes the intrapulmonary pressure to drop. Air flows into the lungs until the intrapulmonary pressure equals the atmospheric pressure. \n\nDuring expiration, the inspiratory muscles relax, the diaphragm rises, and the rib cage descends. The thoracic cavity volume decreases, causing the the lungs to recoil, and the intrapulmonary volume decreases. This causes the intrapulmonary pressure to rise, and the air flows out of the lungs until the intrapulmonary pressure equals the atmospheric pressure.
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please give an example...
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As a general rule, warm air rises and cool air sinks\nit expands and becomes lighter as the molecules of air move farther apart
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You better read something on this:\nhttp://en.wikipedia.org/wiki/Pressure
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1. concentration and pressure\n2. see sources
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air is moved into the lungs
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the resistive force that air will exert upon an object moving through it at a given velocity.\n\nthe equation is Drag= 1/2 cpav2 (squared)\n\nc is a constant.\np is the density of the fluid (air in this case)\na is the cross sectional area of the object\nv is the velocity of the object.
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Example for produce:\nForced-air cooling is a useful tool for preserving the quality of fresh produce. It is most effective when the produce demands quick cooling or when the amount of produce to be cooled per day or week is large enough to justify the increased equipment and electrical demand costs.\n\nForced-air cooling is accomplished by exposing packages of produce in a cooling room to higher air pressure on one side than on the other. This pressure difference forces the cool air through the packages and past the produce, where it picks up heat, greatly increasing the rate of heat transfer. Depending on the temperature, airflow rate, and type of produce being cooled, forced-air cooling can be from 4 to 10 times faster than room cooling.