Critical thinking Explain why water as ice is not a fluid but water as a liquid or steam is a fluid.
Answer: Fluids do not possess definite shape, because the atoms or molecules in the fluid are free to move past each other. Ice is a solid in which the water molecules are bound together in a crystalline arrangement that prevents their moving past each other. Ice therefore has a definite shape, and does not flow. The molecules in liquid water or steam are able to move past each other, so that liquid water or steam flows and has no definite shape, and therefore is a fluid.
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