| gas: | A form of matter that is neither a solid or a liquid. The molecules of a gas are spread widely apart. A gas does not have a definite volume and does not have a free surface like a liquid does. Air is a gas. | |
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| gas: | A form of matter that is neither a solid or a liquid. The molecules of a gas are spread widely apart. A gas does not have a definite volume and does not have a free surface like a liquid does. Air is a gas. | |
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