Mr. Harte's Fourth Class

We investigated three different ways of showing air pressure.

1. We inflated a balloon in a cup and due to the strong air pressure in the balloon, we lifted the plastic cup.

2. We filled a bottle and pierced a hole in it. The water stayed in the bottle because of the air pressure in the room and then when we removed the lid, the air pressure increased and so the water started to flow out the small hole.

3. We placed card on top of a glass of water and turned it upside down. The water did not spill because the air pressure pushed the air against the card.

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