Boyle's Law shows that the pressure exerted by a gas sample and its volume are inversely proportional (if one goes up, the other goes down).
PV = constant 1*
P1V1 = P2V2 Thus if the
pressure or
volume of a gas sample is
changed, provided
one of the new values is
known, the
other can be
calculated.
The two volumes must have the same units.
The two pressures must have the same units
Charles' Law shows that the volume of an ideal gas sample is directly proportional to its temperature in Kelvin.
Thus if the
volume or temperature of a gas sample is
changed, provided
one of the new values is
known, the
other can be
calculated.
The two volumes must have the same units.
The temperatures MUST be in Kelvin.
The General Gas Law combines Boyle's and Charles' Laws.
Thus if the initial volume, pressure and temperature of a gas sample are known as well as two of pressure, volume and temperature under new conditions, the third can be calculated.
*If the pressure, temperature or volume for a particular sample of gas is changed, there is no change in constant 1 (or constant 2 or constant 3). This means for example that for example:
P1V1 = constant 1 = P2V2
Thus P1V1 = P2V2