The density of water is 1 g/cc. This is strictly valid at :

(A) 0°C
(B) 4°C
(C) 25°C
(D) 100°C

Correct Answer : 4°C
Explanation : Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 kg/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
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