Fact 1: Condensation is when change from a gas into a liquid by reducing heat energy.

Fact 2: Condensing is a gas turning into a liquid.

Given the two facts above, answer the question "What causes a gas to condense?" with the following options: 
- Energy.
 - kinetic energy
 - Water expanding
 - It gets heated up
 - It expands
 - circulatory system
 - reduced heat
 - less water


 

       reduced heat  