The law of volumes, or Charles law , is an experimental gas law that describes how gases expand when heated. Charles law states that "When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be in direct proportion". Learn Charles Law with stepwise derivation, graphs, examples, and applications in chemistry. Master gas volume-temperature relationships for exams and real-life understanding. Charles Law Application in Real Life Charles Law Solved Problems What Is Charles Law ? Charles’ law , also sometimes referred to as the law of volumes, gives a detailed account of how gas expands when the temperature is increased. Conversely, when there is a decrease in temperature, it will lead to a decrease in volume. Learn about the experimental gas law that describes how gases expand when heated, named after Jacques Charles . Find out the history, formula, applications and limitations of Charles 's law .