As scientists this week, Year 1 have been carrying out comparative tests to identify which materials are the most suitable to make a waterproof hat for Barney the Bear.
We begun by discussing which materials we though would be waterproof. Lots of us though tin foil, plastic and wood were going to not let water through them.
We recorded our predictions on a table before we carried out a fair test.
First we put Barney in a bowl, then we held materials above his head and put water on them with a pipette. We observed what happened to the water once it was on the material. Some materials soaked up the water and we knew this meant they weren’t waterproof. Other materials just made the water run off and we knew these were waterproof.
Lots of us were surprised that the wood was not waterproof. the water soaked in to the wood.
We observed very closely how the water soaked into the material and paper and how the water just sat in a puddle on top of the metal, plastic and tin foil.
We decided that Barneys hat should be made of plastic as this was the softest of the waterproof materials. We though wood would be too heavy and the tin foil would be very noisy in the rain.