Gases: Boyle's Law and Charles's Law
For most gases and under a wide range of conditions, the ratio of volume to temperature, for a gas at constant pressure, is constant; V/T = constant. This is known as Charles' Law.
For most gases and under a wide range of conditions, the product of pressure and volume, for a constant temperature, is constant; PV= constant. This is known as Boyle's Law.
Charles' and Boyle's Law may be combined as PV/T = constant or PV/T = PoVo/To.
For constant volume:
For constant temperature:
This is known as Boyle's Law.
For constant pressure:
This is known as Charles' Law.
Combining these, we have
This is known as the ideal gas law.
n = number of moles
A mole of gas molecules is Avagadro's number NA of molecules,
NA = 6.02 x 1023
R = universal gas constant
R = 8.314 J/mole-K
(c) 2002, Doug Davis; all rights reserved
ToC Ideal Gases Return to ToC, Thermodynamics