Monday, September 20, 2010

phenomenon of pressure

Pressure
[noun]
1 continuous physical force exerted on or against an object by something in contact with it; the force per unit area exerted by a fluid against a surface with which it is in contact
2 the use of persuasion or intimidation to make someone do something; the influence or effect of someone or something; a sense of stressful urgency caused by having too many demands on one's time or resources
[verb]
-attempt to persuade or coerce (someone) into doing something
Pressure (the symbol: P) is the force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.
Pressure is a scalar quantity. It is transmitted to solid boundaries or across arbitrary sections of fluid normal to these boundaries or sections at every point.
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 follows:
standard atmosphere = 101325 Pa = 101.325 kPa
atmospheric pressure
ambient pressure
altitude sensing
surface pressure
dynamic pressure
internal pressure
pressure differential
dispersed pressure
concentrated pressure
directed pressure
negative pressure
vapor pressure
-pressure in relation to temperature changes, humidity, drafts, vibration, sound pressure are several potential explorations.
-wind speed and direction will also fluctuate the barometer
-air conditioning may create a pressure differential between the inside and outside of the room.
-use of a hygrometer to measure air humidity or the water vapor in the air.

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