Fact 1: Boiling means change from a liquid into a gas by adding heat energy.

Fact 2: Heat is Energy and is measured in Joules.

Given the two facts above, answer the question "How is the change of a liquid to a gas measured?" with the following options: 
- Dilution
 - Joules
 - density
 - thirst
 - forces
 - H20
 - motion
 - boiling


 

  Joules       