You are presented with the question "condensing means changing from a gas into a liquid by reducing what?" and the following answer choices: 
- moving molecules
 - Temperature
 - water
 - Evaporation
 - hydrogen and oxygen
 - petroleum
 - Water expanding
 - humidity

Now knowing that condensing means changing from a gas into a liquid by reducing heat energy and heat is the energy of moving molecules, choose the best answer.


 

 moving molecules        