Which law states that the volume of a gas is directly proportional to its temperature in Kelvin?

The law that states that the volume of a gas is directly proportional to its temperature in Kelvin is Charles's Law. This law highlights the relationship between volume and temperature, indicating that as the temperature of a gas increases, its volume also increases, provided that the pressure remains constant. The relationship is mathematically expressed as V/T = k, where V is volume, T is temperature in Kelvin, and k is a constant.

In practical terms, this means that if you heat a gas, its particles gain energy, move more rapidly, and push against the walls of their container more forcefully, resulting in an increase in volume. This fundamental principle is essential for understanding gas behaviors in various conditions and is widely applied in scientific and industrial processes.