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We're going to use a balloon for more tricks. Stretch a sheet of rubber cut from a balloon over the mouth of an empty can. Attach the rubber tightly to the can with a rubber band. The gas (air) in the can will now be in a closed system, isolated, and generally independent of the outside air.

Influences on the isolated gas (air) can create observable changes in the flexible rubber lid.

While your teacher heats the can over a candle, observe the rubber lid. The air inside will expand and cause the lid to expand to accommodate the larger volume of the same amount of

Next, cool the container with a damp cloth or ice cube, and observe the lid. The cooling air inside will contract (the molecules will be smaller), and the outside air will push the lid down.

Several alternative or supplementary activities can also be carried out:

Dip the mouth of a medicine bottle in soapy water to produce a film across the opening of the bottle. The film will expand if warm hands are placed on the bottle.

Can you remember any personal experiences with bottle caps which pop off unexpectedly? Recall the sequence of events prior to the popping.

Take a cold soft drink bottle from the refrigerator, pour out a small amount, drink the small amount, and re-cap the bottle. Do not put it back into the refrigerator. Let the bottle sit in the warm room, and wait for the air inside the bottle to get warm and expand. As the air expands, it presses harder against the sides and top of the bottle, causing the cap to pop off.

This writer's grandmother used to make root beer. Since she would make about a hundred bottles, she couldn't keep it in the refrigerator. She would, instead, store it in the basement, with all her canned fruit, where it was cool. Sometimes in the summer, there would be a series of very warm days, and the basement would get a little warmer than usual. I can remember we would sit in the kitchen, and suddenly, from down below, we would hear what sounded like an explosion! Yep, you guessed it! Another bottle of root beer popped its cap!

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