- CianLv 51 decade agoFavorite Answer
For a fixed amount of an ideal gas kept at a fixed temperature, P (pressure) and V (volume) are inversely proportional (while one increases, the other decreases).
The basic equation is:
PV = k, where k is a constant value.
This enables us to derive the more commonly used formula:
P1V1 = P2V2.
where p1 and v1 are the pressure & volume before a change in the system, and p2 and v2 are the final pressure & volume of the system after it has changed.Source(s): my Ph.D.in Chemistry