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fluid

fluid, any substance that is able to flow. Of the four states of matter, only a solid is not a fluid, since it has a definite shape that is not readily changed. Any liquid, gas, or plasma is classed as a fluid.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

More on fluid from Infoplease:

fluid: meaning and definitions - fluid: Definition and Pronunciation
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lighter fluid: meaning and definitions - lighter fluid: Definition and Pronunciation
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See more Encyclopedia articles on: Physics

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