How Does Air Change In Different Temperatures?

 2 Science experiments this afternoon!! With all the water bottles in use for Athletics Day we were able to do this experiment as well! The results were amazing with this one- and this experiment was a lot easier for us to do.

Does Air Change In Different Temperatures?

You need:

2 plastic bottles

2 containers wider than the bottles

2 balloons

2 rubber bands

What to do:

1.      Place 2 deflated balloons over the tops of the 2 bottles. (We used red and blue balloons to help identify temperature)

2.      Use rubber bands to secure the balloons in lace.

3.      Place the balloons in the wide containers.

4.      Fill one container with ice cubes. (For the blue balloon bottle)

5.      Carefully fill the other with hot water (For the red balloon bottle)

6.      What do you observe?

When air gets warm, it expands. That inflates the balloon. Cool air contracts, causing the other bottle to shrink.
In this case, the blue balloon not only contracted, it went all the way inside the bottle!

How Does Hot Air Rise Up Through Cold Air?

Here's an experiment we tried to see how hot air rises up through cold air. We used water as it follows the same principles.

We needed:

 Small glass

·        Jug

·        Hot and cold water

·        Food colouring

·        Glad wrap

·        Rubber band

·        Large clear bowl

·        Skewer

What we did:

1.     Use the jug to fill a glass with hot water.

2.     Add some food colouring to help you see the water moving more easily

3.     Cover the glass with glad wrap.

4.     Secure it with a rubber band. Put the glass in the large bowl

5.     Fill the bowl with cold water until the water level is well above the glass.

6.     Poke a hole in the glad wrap with the skewer.

7.     

We watched what happened to the coloured water. It was interesting how it sat on the top of the cold water.

This experiment shows how convection works. Warm water rises through cold water, just as hot air rises through cold air.