Charles's law states that, at constant presuure, the volume, V, of a given mass of gas is directly proportional to the absolute temperature.
This directly proportional relationship can be written as: where: V is the volume of the gas. T is the temperature of the gas (measured in Kelvin). k is a constant.
Because the formula is equal to a constant, Charles's law can be rewritten as:
The law was named after scientist Jacques Charles, who formulated the original law in his unpublished work from the 1780s.
Example: A gas with a volume of 2 liters at 100 K is heated to 200 K. What is the new volume with no change in pressure?
Charles's law is based upon absolute temperature. The absolute temperature is calculated by adding 273 to the temperature in Celsius scale. 10°C is equiavalent to 283 K.