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Well, pressure has to be kept constant and so does the mass of the gas with Charles's Law. Charles's Law--V1/T1=V2/T2--can be derived from the Combined Gas Law--V1xP1/T1=V2xP2/T2--by keeping the pressure constant which in turn cancels out the pressure in the Combined Gas Law leaving you with Charles's Law. Hope that helps you!

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14y ago
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9y ago

In Charles's Law, when the pressure in a sample of dry gas is held constant, the Kelvin temperature and volume will be directly related.

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9y ago

The variables are the volume and the temperature: V/T=k.

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8y ago

Pressure must remain constant: volume and temperature are the variables.

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Q: What two variables must remain constant when testing Charles's law?
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