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23.11.20
In Twmbarlwm Science club this week we carried out an experiement. Mrs Lines told us that we could poke a pencil through a plastic bag, filled with water without it leaking!! So we wanted to test whether it was true. First, we predicited what we thought would happen. We all thought the water would leak out of the bag!
However, we were amazed to see no water leaked out of the bag! This is because sandwich bags are made of polymer, which is made up of chains of molecules. When you poke a sharp pencil through the bag, it pushes through the chain of molecules. Then, the molecules 'hug' around the pencil to create a seal so that no water can leak out!
Well done Mrs Lines - You were right!!
