9.40. Assertion: An ice cube floats on water.
Reason: Density of ice is more than that of water.
9.40. Assertion: An ice cube floats on water.
Reason: Density of ice is more than that of water.
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1 Answer
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9.40. (c) The crystalline form of water is ice. Atatmospheric pressure ice crystallises in the hexagonal form, but at very low temperatures it condenses to cubic form. Density of ice is less than that of water. Therefore, an ice cube floats on water. In winter season ice formed on the surface of a lake provides thermal insulation which ensures the survival of the aquatic life. This fact is of great ecological significance.
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