Air can be Compressed
Take a plastic pop bottle and with the cap off the bottle, hold you hand above the mouth of the bottle and squeeze. What do you feel? Screw the cap on tightly and squeeze again. What happens when you squeeze the bottle now? Now, fill the bottle completely with water, replace the cap and squeeze again. What do you feel now?
When you squeezed the open bottle, you forced some of the air out of the mouth. When you placed the cap on the bottle and squeezed again, there was no place for the air to go, but you were able to squeeze the bottle together. In other words, you were able to compress (or squeeze together) the air inside the bottle. However, when you filled the bottle with water and capped it, you could not squeeze the bottle very much at all because you could not compress the water inside.
Gases such as air can be compressed, but liquids such as water, cannot be compressed.
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