You are presented with the question "What does liquid turn into when it's heated?" and the following answer choices: 
- Ice
 - heat
 - Water
 - H20
 - mL
 - Oil
 - Gas
 - Urea

Now knowing that heating a liquid can be used to identify that liquid 's boiling point and boiling is the conversion of a liquid to a gas, choose the best answer.


 

       Gas  