Hi again! Recently I did an awesome science experiment with pressure. I filled a 2 litre drink bottle with water, then cut out a person shape out of plastic and attached a pen lid to his head with a paper clip. Put the person in the bottle, put the lid on, and...DAH-DUM-DAAAAH...I squeezed the bottle and he SANK! I let go and he FLOATED! Here is a picture...
Can you see him? You can draw a background too, and sticky it to the back of the bottle.
WHAT THE HECK IS GOIN' ON?
Well, an air bubble get trapped in the pen lid when the diver dives into the bottle. Squeeze the bottle, and water gets shoved into the pen lid and squishifies the air bubble, letting water in, so he sinks. (Ahh!) When you release the bottle, the air bubble goes back to normal size again, pushed the water out of the pen lid, making the diver float! Amazing.
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water
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