Fact 1: Heating a liquid can be used to identify that liquid 's boiling point.

Fact 2: Because at the boiling point of water, there are molecules that are a gas and that are a liquid.

Given the two facts above, answer the question "What does boiling change a liquid into?" with the following options: 
- oil
 - heat
 - SO2
 - salt
 - ice
 - solid
 - water
 - gas


 

        gas 