Tuesday, January 22, 2013

Standard Conditions: Pressure


For gas laws, standard pressure is considered the average pressure at sea level or 1 atmosphere (atm).

There are several other units used for pressure.

Using a barometer with mercury, standard atmospheric pressure will support a column of mercury 760 mm high.  This became a unit, or  mmHg.  Another name for mmHg is torr.
1 atm = 760 mmHg = 760 torrs

The SI unit is the pascal (Pa) which is equal to 1 Newton/meter2 . 
1 atm = 101.325 kiloPascals (kPa)

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