During the last few
weeks we have been conducting scientific investigations into the topic of Air.We
came up with a list of questions for our wonderings wall which we have been
researching using google docs to complete a shared project together.
Last week we did some
experiments to help us to learn more about Air. We are now going to show you a
video of what we did and explain what each experiment taught us about air.
In the first
experiment, a plastic bottle with a balloon over the end of it was placed in a
bowl of cold water……nothing happened. We then put the same bottle in a jug of
hot water and the balloon immediately started to inflate. This shows us that
when air is heated, it rises.
Next, we did an
experiment which involved half filling a cup with water. A small piece of
cardboard was placed over the cup and the cup was turned upside down very
quickly. Instead of spilling out, the card stayed in place because the air
pressure on the inside of the cup was balanced by the air pressure on the outside.
For our next
experiment, a balloon was attached to the inside of a plastic bottle which had
a small hole in the side of it. We were able to inflate the balloon not by
blowing air into it, but by sucking the air out from inside the bottle. The
greater air pressure on the outside of the bottle caused the balloon to
inflate.
Finally, we lit a small
piece of paper and put it inside a milk bottle. A hard boiled egg was then
placed on top of the milk bottle. Because the warm air pushed past the egg and
lowered the air pressure on the inside of the bottle, the greater air pressure
on the outside pushed the egg into the bottle
