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===Formula===
<math>πp\timesπ=constant</math>
Where:
and
<math>π </math> is [[Volume (Space)|volume]]
When there is a change of [[pressure]] and [[Volume (Space)|volume]] of a known amount of a substance at constant [[temperature]] the following formula can be used:
<math>π_1p_1\timesπ_1=π_2p_2\timesπ_2</math>
Where the number represents before and after the change.