Dry ice

Brrrrrrr! It's cold. Today at Enrich I did three dry ice experiments. In the first one we had to put the dry ice in a long tube with cold water and food colouring. What happens is bubbles and the cold water comes out [whatever colour you choose]. After we did the other two we did one ourselves. What we did was fill the cup three quarters high, put food colouring in and put dry ice in. If you want to make it bubble more put more cold water in.