You are presented with the quiz "The what of vaporization changes a gas into a liquid by reducing heat energy?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "condensing means changing from a gas into a liquid by reducing heat energy" and "condensation is the reverse of vaporization , or change from liquid to gas". 

So, what's the best answer to the question?


 

  reverse         