Charles' Law
It can be shown, using a glass tube open at one end containing dry air trapped in the tube by a suitable liquid, that for a fixed mass of gas, the volume of the gas V is directly proportional to its temperature T provided its pressure is kept constant.

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Key terms in this lesson
- absolute zero
- The lowest possible temperature, 0 K or minus 273.15 degrees Celsius, at which a substance has minimum internal energy.