You are presented with the question "What can be a gas or a liquid?" and the following answer choices: 
- Alcohol
 - ozone
 - water
 - vapors
 - heat
 - blood
 - NaCl
 - shale

Now knowing that condensing means changing from a gas into a liquid by reducing heat energy and water can easily condense on the cold end of the probe, choose the best answer.


 

   water      