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Water shows anomalous expansion between 0°C and 10°C. Option A is wrong — continuous volume increase would be normal thermal expansion. Water does NOT follow this from 0 to 4°C. At 4°C water reaches its MAXIMUM DENSITY. This anomalous behavior is due to the hydrogen bonding structure of water breaking down as temperature rises from 0 to 4°C, allowing molecules to pack more closely. Option C is wrong — continuous decrease would mean water always contracts on heating which is false above 4°C. Option D is wrong — volume cannot remain constant as temperature changes in real liquids.
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Heat is a form of energy that transfers between objects or systems due to a temperature difference, moving from a hotter body to a cooler one until thermal equilibrium is reached.
