What does temperature really measure?
In this demonstration, you will see what happen to air when its temperature increases.
You will need a bowl of ice water.
Run your tap until it gets hot. Once it gets hot, fill the bowl 3/4 way full and stand the bottle in the bowl as before. Wait a few minutes and you will see something like this.
Temperature: A measure of the energy of motion in a substance's molecules
source: Exploring Creation with Physical Science, Wile