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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.
When we put Boyle's Law, Charles' Law and Gay-Lussac's Law together, we come up with the combined gas law, which shows that: 1  Pressure is inversely proportional to volume, or higher volume equals lower pressure.