AIR PRESSURE IS AMAZING

We did an experiment to find out how bubbles of air can make this float and sink in water. The force that makes this happen inside the bubble is called air pressure. In our experiment we filled a bottle with water and put a diver inside it. We made the diver from a plastic bag and attached it to a paperclip. The diver was supposed to sink when the bottle was squeezed and float when it was not squeezed. Unfortunately, this did not work. My diver just got stuck upside down. We are not sure why this happened. It is a mystery!

The next experiment we did worked much better. I screwed up a piece of paper and put it in the bottom of a glass. I filled up the washing bowl with water and then turned the glass upside down and put it in the water. You will never believe it, but the paper stayed completely dry! This is because the air inside the glass pushed up against the paper and kept it dry. Amazing!

 

 

We then did another amazing experiment. We filled a glass of water and put a piece of card underneath it. When we turned the glass of water upside down, the card stuck to it. Even though the water is really heavy it did not fall down! The reason this happens is because the pressure of the air pushing underneath the card is stronger than the pressure of the water to break the seal around the glass.