- Boiling means matter / a substance changes from a liquid into a gas by increasing heat energy
- Water is a kind of substance
- Therefore, water boiling is when water changes from a liquid into a gas

- Water boiling is when water changes from a liquid into a gas
- Water is in the liquid state , called liquid water , for temperatures between 0 c and 100 c
- Water is in the gas state , called water vapor / steam, for temperatures above 100 c
- So, water boiling is when water changes from liquid water to water vapor

So, water boiling is when water changes from liquid water to water vapor
Question
What happens to water when it boils?

Context
- Boiling means matter / a substance changes from a liquid into a gas by increasing heat energy 
- Water is in the liquid state , called liquid water , for temperatures between 0 c and 100 c 
- Water is in the gas state , called water vapor / steam, for temperatures above 100 c 
- Water is a kind of substance