Gas pressure

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Try to explain why the egg goes into the bottle.

The burning paper strip heats the air inside the bottle. When air is heated, it (a)__________ (expands / contracts) and takes up more room. As a result, some of it escapes out of the bottle.

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When the paper strip goes out, the air inside the bottle cools. This causes a (b)____________ (higher / lower) gas pressure inside the bottle. The great (c)____________ pressure outside forces the egg to fall into the bottle.

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The hitting of gas particles on a container’s inner wall gives rise to ______________________ .

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When objects are hit by the air particles in the atmosphere, a pressure is produced. The pressure is called ______________________ .