We half filled a ziplock bag with water and sealed it. Then we stuck sharply pointed pencils through the bag. Amazingly, no water came out. This is becasue the bag is made of long chains of molecules called polymers. When the pencil is pushed through the polymers they make a very good seal around the pencil and so the water can't come out. |
We half filled a glass with water. Then we put a Match Attax card over the mouth of the glass. Then Mr. Musgrave carefully turned the glass upside down while holding the card in place.
Brave Oisín "volunteered" to stand under the glass. When Mr. Musgrave took his hand away the water did not spill all over Oisín. Wow! This happens because even though we don't feel it the air around us exerts pressure. The pressure of the air on the card is enough to stop the weight of the water from pushing the card down. |
We carefully placed a paper-clip onto the surface of a bowl of water. The paper-clip floated. This is because the force of the surface tension caused by the molecules of water at the surface |
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