Boyle's Law (P1V1 = P2V2)

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P1V1 = P2V2

What each symbol means

SymbolWhat it stands for
P_1, P_2Pressure at states 1 and 2 (consistent units)
V_1, V_2Volume at states 1 and 2 (consistent units)

When to use this

Fixed moles; constant temperature.