Pressure!. Pressure Defined Force per unit area Force is a push or pull  Units of force are Newtons P = F/a Measured with a barometer.

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Presentation transcript:

Pressure!

Pressure Defined Force per unit area Force is a push or pull  Units of force are Newtons P = F/a Measured with a barometer

Barometers Mercury barometer Anaeroid barometer

Units of Pressure Millimeters of mercury  Mercury rises 760 mm at sea level  Torricelli (Torr) units are the same size Atmospheric pressure  Pressure at sea level is 1 atmo Pascal  1 N/ 1 m 2

Standard Temperature and Pressure STP Exactly 1 atmo and 0 o C Gases commonly measured at this standard T and P condition

Sample Problem 10-1 The average atmospheric pressure in Denver, Colorado is atmo. Express this in:  mm Hg  kPa

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