Which is denser—water at 15°C, water at 4°C, or water at 60°C? Explain

Explanation:

Basically it's because of two opposing forces: thermal kinetic expansion and H-bonding. One is the fundamental thermal force, that as things get warmer, the molecules move around more, so they get farther apart and so become less dense. ... At 4 degrees C these two forces work out to make water the most dense

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