Inspiration
I did these in 6th grade science class (thanks Mr Green) and once or twice in cub scouts.
Materials
Milk Bottle
Peeled Hard Boiled Egg
6"x2" strips of paper
Tea light candle
Food coloring
Glass vase
Notes
This is a classic demonstration of combustion and vacuum. The combination of the combustion and heat from the flame warming and pushing some air out before it goes out, cools and creates a vacuum. Folding the paper lengthwise helps for getting it in to the bottle fast (as it will be on fire). As an immediate follow up I got a floating candle to pan of food coloring water to illustrate the same principal with a rising water level.
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| Test Fitting |
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| Add fire |
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| Add egg |
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| FWOOMP! The effect is dramatic both on the egg and the girls. |
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| Now to remove the egg from the bottle I just blew in to increase the pressure to let the process reverse itself |
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| Lana getting ready to cover the lit candle to see the same effect in a different light. |
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| We let the candle heat up the air in the vase for a while first before sealing it against the water to get a nice vacuum. |
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