Charles’s law explains how the volume of a gas changes with temperature when pressure is kept constant.
In simple terms:
- When the temperature of a gas increases, its volume increases.
- When the temperature decreases, its volume decreases.
- This happens because gas particles move faster at higher temperatures, so they push the container walls more and occupy more space.
Key idea: Gas volume is directly proportional to its temperature (in Kelvin) at constant pressure.