CHEM 1201 Study Guide - Ideal Gas, Root Mean Square, International System Of Units
Document Summary
Si units: 1 n = 1 kgm/s2; 1 pa = 1 n/m2. Atmospheric pressure and the barometer: atmospheric pressure is measured with a barometer. If a tube is inserted into a container of mercury open to the atmosphere, the mercury will rise 760 mm up the tube. Standard atmospheric pressure is the pressure required to support 760 mm of hg in a column: units: 1 atm = 760 mm hg = 760 torr = 1. 01325 x 105 pa = 101. 325 kpa. Pressures of enclosed gases and manometers: the pressure of gases not open to the atmosphere are measured in manometers, a manometer consists of a bulb of gas attached to a u-tube containing hg. If the u-tube is closed, then the pressure of the gas is the difference in height of the liquid (usually hg). If the u-tube is open to the atmosphere, a correction term needs to be added: If pgas < patm then pgas + ph2 = patm.
