Gas Laws
1. Boyle’s law- Pressure vs Volume
LAW
Boyle’s law states, “For a fixed mass of gas at constant temperature, the
pressure and the volume of a gas are inversely proportional.”
EQUATION
P1V1 =P2V2
P1 = original or initial pressure given [units Pascal (Pa), millimeters of
mercury (mmHg), or atmospheres (atm)]
V1 = original or initial volume given (units L, m3, cm3, ml)
P2 = changed or new pressure (same units as P1)
V2 = changed or new volume (same units as V1)
2. Charles’ Law- Temperature vs Volume
LAW
Charles’ Law states, “If a given quantity of gas is held at a constant pressure, its volume
is directly proportional to the absolute temperature.”
EQUATION
V1 = V2
T1
T2
V1 = initial volume in L, m3 or cm3 or ml
T1 = initial or first temperature in Kelvin
V2 = changed or new volume (same units as V1)
T2 = changed or new temperature (same units T1)
3. Gay Lussac’s Law
LAW
Gay Lussac’s law states that, “The pressure of a given amount of gas held at
constant volume is directly proportional to the Kelvin temperature.”
EQUATION
P1
T1
= P2
T2
P1 = original or initial pressure given [units Pascal (Pa), millimeters of mercury
(mmHg), or atmospheres (atm)]
T1 = initial or first temperature in Kelvin
P2 = changed or new pressure (same units as P1)
T2 = changed or new temperature (same units T1)