# Investigating air pressure – more eggs!

Today we are looking at air pressure with this fun air pressure investigation.

Air pressure is the force exerted by air on any surface in contact with it.

We are going to demonstrate air pressure by using it to force an egg into a bottle.

## Air Pressure Investigation

What you need:

A boiled egg

A glass bottle or jar with a neck a little smaller than an egg

2 matches

What to do:

• Place the cooled boiled egg on top of the glass bottle, making sure there is no way the egg fits through.

• Ask an adult to light two matches and drop them inside the glass jar, quickly place the egg back on top.
• Watch as the egg drops inside the jar.

The Science Bit

The matches heat up the air inside the glass jar. The air then expands and some escapes out of the jar. Once the matches go out, the air starts to cool, making the pressure drop. The air outside the jar now has a higher pressure than the inside, and forces its way inside the jar, forcing the egg downwards as it does so.

Our jar was quite small, so it would be interesting to see what would happen if a larger one was used. If you try please let us know!

Don’t forget to check out our other air pressure experiments for kids.

1. Mariann

Fantastic! Thanks for sharing

2. maggy, red ted art

Ooh very clever… does take me back to science days.. I would have tipped on that there is “less air” in the jar once the fire has “consumed it”… thus lower pressure. Need to scrubbed up my physics. Makes me have a good think again!

Thank you for linking to kids (&mums) get crafty!

Maggy

1. ScienceSparks

Thank you. x

3. Liberty

Love this one too!!! Thanks!

1. ScienceSparks

1. melissa

Quick question you stated that the air had less pressure because of a warming/cooling, expansion/contraction reaction. I was under the reasoning that the air pressure was less was because you removed the air and created a vacuum in the container. Since fire consumes oxygen, the fire from the match consumes the oxygen creating a vacuum, the suction effect.

4. Aimee

Another fantastic idea! Thanks for sharing it with us!

1. ScienceSparks

Thank you. xx

5. Liz

This is so fun! I will be adding it to our list of ‘eggtivities’.. Thanks for sharing, with video and all!!

1. ScienceSparks

6. Nancy

Having trouble finding glass jar with top right size – any suggestions???

1. ScienceSparks

We used a small stir fry sauce jar..

7. jayne

it’s a success

8. Kayren

with a larger jar it should suck the egg down into the bottom of it- did this with my kids in 8th grade science class and it never ceases to amaze them (me too)

9. Science magic

[…] How about showing how an egg is too big to fit into a jar and then watching as it drops gently inside. […]

10. Egg science experiments

[…] Air Pressure – find out how to get an egg through a small jar. Watch as the egg drops into the jar like magic. […]

[…] have looked at air pressure with eggs before. This experiment shows you how to make a Barometer which measures air […]

12. eloise

awesome! what do you do with the egg and the jar afterwards?! will try it later.. thanks

1. ScienceSparks

There isn’t much you can do with it really unfortunately.

13. Andy

To get the egg out all you need to do is create a higher pressure inside the container. This can be done by holding it upside down and blowing air into it. Since it’s upside down the egg will act as a plug when you stop blowing. With the higher pressure inside of the container now, the egg should pop out.

14. Laura

Hints on if you are somewhere you can’t use matches? And is the egg peeled?

1. Anna

Is the egg peeled ?

15. joyce

we did this with a balloon filled with water – eggs are a bit too precious over here – and it worked beautifully

16. Anna

I’m guessing the egg needs to be peeled, right ?

17. M Maggart

You can also use a small hollow rubber ball it acts like the egg but doesn’t break up. Rinse out the burnt material and ” blow ” the ball out of the jar( same way it got in) Blowing into the jar makes the air inside at a greater pressure than the air outside and the ball pops out. Make sure you tilt the jar uoside down so the ball comes down to the neck when you blow into the jar and it pops out.

18. Crystal

Thank you for great science experiments!

19. Izzy

What how did the egg got in because of the fire

20. Izzy

You guys are amazing thanks for the idea