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An animation demonstrating the relationship between volume and temperature. Charles's law (also known as the law of volumes) is an experimental gas law which describes how gases tend to expand when heated. A modern statement of Charles's law is.
Other gas laws [edit]. 1  Graham's law states that the rate at which gas molecules diffuse is inversely proportional to the square root of its density. 2  Dalton's law of partial pressures states that the pressure of a mixture of gases simply is the sum of the partial pressures of the individual components.