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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.
As evident in the graph above, Charlesâs Law also helps us define absolute temperature (0 K or -273.15 C). According to the expression, absolute temperature is the temperature at which the volume of a gas is zero. Applications Hot air balloons. This is the most common application of Charlesâs Law.