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- 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

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