- Water is boiling in the pot
- Boiling means a substance changes from a liquid into a gas by increasing heat energy
- Water is a kind of liquid at room temperature
- So, water changes from a liquid to a gas when it is boiling

Therefore, water changes from a liquid to a gas when it is boiling
Q: Jonathan places a pot of water on a stove. As the water boils, how does the state of the water change?
Context:
- Water is boiling in the pot 
- Boiling means a substance changes from a liquid into a gas by increasing heat energy 
- Water is a kind of liquid at room temperature