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Gases are unique because unlike other states of matter, gases can expand to fill the shape and volume of its container. Likewise, gases can also be compressed so that a lot of gas can be forced into a small container. What is compressibility? What happens if we compress a solid?
Think about it: especially compared to other states of matter, there's a lot of empty space between gas molecules. Compressing gas just helps close the gap between molecules!
Compressed gases are used in many situations, like in scuba tanks. How else is compressed gas used?
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