The product of a gas's volume and pressure is always a constant, as long as the gas's temperature stays the same.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>
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The product of a gas's volume and pressure is always a constant, as long as the gas's temperature stays the same:
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PV = constant, or, <math>P_1V_1 = P_2V_2</math>
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<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>