Question:

Does Water Pressure affect the atmospheric pressure? And Why?

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"Why does higher velocity creates lower pressure?"

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  1. If the atmosphere of the earth was dead still for one day (no wind, etc.) and also zero humidity, the pressure on the earth per square inch of soil at sea level would represent only the weight of the (dry) air above.  For example, picture a square tapered cylinder extending from the ground to outer space and the pressure results from the weight of all the air molecules within the cylinder.  Now add 100% humidity and there must be additional molecules (H2O) adding more weight.  In real life differential temperatures and humidity create winds and circular motion of the air masses resulting in high and low barometric pressures and we lose 'sight' of the fact that atmospheric gases have weight that exerts pressure on the ground.

    Next, examine a swinging pendulum that converts potential energy of height to kinetic energy of motion at its lowest point and back and forth until the energy is dissapated by friction.  No energy is lost or created by the swinging mass itself (only by friction).  When a gas is under pressure it has potential energy but when it flows some of the energy is converted to kinetic energy (of mass motion) resulting in a loss of pressure.  This of course is the Bernouli principle.


  2. yes...............

    i think bus increase in preasure increases temp & water transfer this temp to atmosphere & atm pr> decrease...........

    due to high velocity all air around will be sucked in and cause low pressure..............

    eg>:hurricanes

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