what happens when water vapor cools?

When water vapor cools, it usually changes back into tiny liquid water droplets in a process called condensation.

Quick Scoop: What happens when water vapor cools?

• The vapor loses heat (thermal energy), so its molecules slow down.

• Slower molecules can stick together, forming liquid water droplets (condensation). This is what you see as clouds, fog, or dew.

• If it is cold enough (below freezing), water vapor can skip the liquid step and turn directly into ice crystals; this process is called deposition and forms frost or some types of snow.

A simple way to picture it: steam from a hot shower hits a cold mirror, cools down, and suddenly becomes visible droplets of water on the glass. That visible “mist” and the droplets are condensed water.

In short: When water vapor cools, it loses energy and turns into liquid water (condensation), and in very cold conditions it can turn straight into ice (deposition).

Information gathered from public forums or data available on the internet and portrayed here.