In Year 4,  pupils have been putting our knowledge of sound to the test. They decided to test whether the amount of water in a glass jar would affect the pitch the glass jar would make when it was gently tapped.

They filled identical glass jars with different amounts of coloured water. Once that was completed, they gently tapped the side of the jars with a ruler. As they listened, the pupils noticed that the more water in the jar the higher the pitch of the sound. They repeated this several times to ensure that our findings were correct. And they were!

Pupils were then able to conclude that, the more water that was added to the jars meant there was less space for the air molecules to vibrate. This in turn meant that as the jar was filled with water, the pitch made from tapping the side to the glass jar became higher.