Boiling is when liquids are heated above their boiling point, and lots of gas bubbles burst over the boiling lakes' surface. Given these facts, what happens when liquids are heated among the following options:
- Evaporation
 - chemical reaction
 - air is cooled
 - food is chilled
 - It expands
 - gas bubbles burst
 - flow of electrons
 - bubbles reduce


 

      gas bubbles burst   