Fact 1: When metal conducts heat , that metal expands.

Fact 2: When the metal aluminum is mentioned, most people think of things like foil and soda cans.

Given the two facts above, answer the question "What happens when soda cans conduct heat?" with the following options: 
- float
 - They expand
 - Evaporation
 - Energy.
 - energy
 - They inflate
 - heating liquids
 - strengthen


 

  They expand       