When a liquid is heated its density __________ (decreases / increases / remains the same).

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Solution

When a substance is heated its volume and its intermolecular space increase and as a result, its density decreases.
We also know that density is defined as mass per unit volume.
So if volume increases, density decreases as they are inversely proportional to each other.
Hence, when a liquid is heated its density decreases.

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(h) A body experiences the same buoyant force when it floats or sinks in water.

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