Charles' law describes the relationship between temperature and volume for ideal gases held at a constant pressure.
The law states that, under constant pressure, temperature and volume vary proportionately. Meaning, as the temperature of a gas increases, its volume also increases.
The equation for Charles' law is V1/T1 = V2/T2
V1 and T1 are volume and temperature under one condition, and V2 and T2 are volume and temperature under another set of conditions.
Behavior of real gases differs from ideal gases, but the relationship between temperature and volume and temperature for real gases is close enough to the idea case that Charles' Law can be applied to real-world cases.
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