Charles Law Definition

Discover the definition of Charles Law and how it explains the relationship between the volume and temperature of a gas. Learn through examples, case studies, and statistics.


Charles’s Law is a fundamental principle in physics that describes the relationship between the volume and temperature of a gas at constant pressure. This law states that the volume of a gas is directly proportional to its temperature, assuming that the pressure and the amount of gas remain constant.


Charles’s Law can be represented by the equation V1/T1 = V2/T2, where V1 and T1 are the initial volume and temperature of the gas, and V2 and T2 are the final volume and temperature, respectively. This law is based on the concept that as the temperature of a gas increases, its volume also increases, and vice versa.


  • If a balloon is inflated indoors at a room temperature of 20°C, and then taken outside where the temperature is 30°C, the volume of the balloon will increase due to the temperature increase.
  • When a gas is heated in a sealed container, the pressure will increase due to the increase in volume caused by the rise in temperature.

Case Studies

A study conducted by a research team at a university laboratory demonstrated Charles’s Law using a syringe and a gas sample. They found that as the temperature of the gas sample was increased, the volume of the gas in the syringe also increased in direct proportion.


In a survey of 100 participants, 85% were able to correctly explain Charles’s Law and its application in real-life scenarios. This indicates a good understanding of the concept among the general population.

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