Charles's law states that at a constant pressure, the volume of a given amount of gas is to its absolute temperature.

-directly proportional
-inversely proportional
-equal to
-not related to

Charles's law states that at a constant pressure, the volume of a given amount of gas is directly proportional to its absolute temperature. Charle's law is also derived from the ideal gas law which states that:

PV = nRT

As you can see, V and T are already directly proportional with each other. The only difference with Charles Law is that pressure was held constant, cancelling out the moles and gas constant.

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