Why does water vapour condense when it reaches high up in the atmosphere?

Water vapor condenses when it reaches higher altitudes in the atmosphere due to a decrease in temperature and pressure. As air rises, it expands and cools, causing the water vapor to lose energy and change from a gas to a liquid state, forming clouds. This process is known as condensation, and it occurs when the air reaches its dew point, where it can no longer hold all the moisture in vapor form.