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The kinetic energy of the gas molecules is greater than the attractive forces between the gas molecules. This means they are moving so fast they 'bump' off of each other maintaining a large average distance between themselves. In Liquids and solids the opposite is true. The attraction forces of the molecules for each other is greater than the kinetic energy so the molecules are very close, basically in touch with each other.

Use water as an example. At normal temperatures water molecules have a strong attraction for other water molecules. This keeps them together as a liquid. Heating increases the kinetic energy of the water molecules. When they have absorbed a lot of kinetic energy the attractions are not great enough to keep them together as a liquid, so they 'boil' forming 'water gas', called steam. Because the extra kinetic energy makes the molecules move so fast they now bounce off of each other instead of attracting and clumping together as a liquid. As steam they now take up over 1000 times as much space as they did as a liquid.

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Q: Why are the molecules loosely packed in gases?
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