Underwater Volcano

Underwater Volcano

We had a look at what happens to hot and cold water when you mix them.

We put a small bottle of hot water and red food colouring into a big glass of cold water.  Then we watched as the hot water rose up from the little bottle, and went to the top of the glass, before cooling down and travelling to the bottom of the glass.  At first it was easy to see which was hot water and which was cold, but after a while the hot water cooled down, the cold water became warmer and the colour of the two waters became the same.  Interesting!