As water cools from room temperature, it contracts in volume and reaches its greatest density at 4°C (39°F).

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Quizplus · Accepted Answer

This is true. Water does contract in volume as it cools, and reaches its maximum density at 4°C (39°F). As water continues to cool below 4°C, it gradually expands again due to the crystallization of the water molecules, which form a lattice-like structure that takes up more space.

As Water Cools from Room Temperature, It Contracts in Volume