Question

The effect of temperature on density is that it : (a) decreases with an increase in temperature (b) increases with an increase in temperature (c) first decreases then increases with a decrease in temperature (d) is not affected by temperature

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Answer

(a) decreases with an increase in temperature

Reason — Most of the substances expand on heating and contract on cooling, but their mass remains unchanged. Therefore, density of most of the substances decreases with the increase in temperature and increases with the decrease in temperature.

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