The changing of water from liquid to gas is called evaporation.

Here's a breakdown:

* Liquid water: Water molecules are close together and attracted to each other.

* Evaporation: When liquid water absorbs enough heat energy, the molecules move faster and break free from the liquid's surface.

* Water vapor: These freed molecules become water vapor, which is a gas.

Evaporation is a crucial part of the water cycle, and it occurs naturally in many ways:

* Boiling: Water boils when it reaches a certain temperature (100 degrees Celsius or 212 degrees Fahrenheit) and rapidly changes into steam.

* Sun's heat: Sunlight warms bodies of water, causing water molecules to evaporate.

* Humidity: The amount of water vapor in the air is called humidity. As the air warms, it can hold more water vapor.

Let me know if you have any other questions!