Year 6 went to the Science Museum.
There was time to explore the hands-on galleries where museum staff were ready to explain when necessary.
Everyone was eager to have a go.
Then it was time for one of the demonstrations called
Crash, bang, wallop.
We were ready to volunteer to help!
Finally, can you guess what Mr Behan photographed here?
Scroll down for the answer.
It was dry ice which changes directly from a solid to a gas unlike ice cubes which melt and become a liquid before turning into a gas as temperature increases.