Heat is really important for how substances change from one form to another, especially through evaporation and condensation.

Evaporation

• How It Works: When a liquid gets heat, it gives energy to its tiny particles, which makes them move faster.
• Example: Picture a puddle on a sunny day. The sun warms up the water, and some particles escape into the air as gas. This is why the puddle gets smaller.
• Important Point: Evaporation can happen at any temperature, but it happens faster when it’s hotter.

Condensation

• Cooling Down: When warm gas cools off, it gives up heat. This makes the gas particles slow down and stick together.
• Example: Have you ever seen droplets of water on a cold glass? That’s condensation! The warm air touches the cool glass, cools down, and turns into tiny water droplets.
• Important Point: Condensation happens when it gets colder, which shows how heat moves from the gas.

In simple terms, heat is what helps evaporation happen (when energy is added), and it also helps condensation (when energy is taken away). These processes are really important in the water cycle and in things we see every day!