Junior Scientist’s

Below is a list of some of our favourite experiments children can try out at home, with normal household items.

But please do not attempt these without parental supervison.

This experiments shows that gas takes up more volume than solids – but it can be messy – so do it outside!

What you need:

  • Alka-Seltzers
  • Water
  • Empty film roll containers

What you do:

Step 1

Pour some water in an empty film roll container. Then add an Alka-Seltzer

Step 2

Put the lid on tightly, put it upside down on the ground and stand well back – and quickly! But be patient; this sometimes takes a moment…

What happens?

The film roll container shoots up like a rocket.

How and why

Gas takes up more space – even more volume – than liquid. When the Alka-Seltza mixes with the water, a gas (carbon dioxide) is produced. This gas takes up lots of space, creating pressure in the small space. Because of all the pressure, the lid is forced off and the container shoots up.