Balloon In A Bottle

*  1 Balloon
*  1 Empty glass jar
*  Scrap of paper towel
*  Matches or lighter

*  Blow up a balloon so that it is a bit larger than the opening of the jar, but can't be easily shoved in.
*  Have an adult light a very small scrap of paper towel and drop it into the jar.
*  Quickly place the balloon on top of the jar.

As the paper towel burns in the bottle it heats up the air inside.  Air always gets bigger when you heat it.  After the flame goes out the air in the bottle will cool and shrink back, creating a vacuum of lower pressure.  The air outside the balloon presses down onto the balloon, pushing it into the bottle.

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