At constant pressure, volume of expansion coefficient of a substance represents the
variation of ______.
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A.
viscosity with temperature
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B.
density with temperature
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C.
specific heat with volume
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D.
thermal conductivity with volume
Correct Answer:
B. density with temperature
Explanation:
The volume expansion coefficient of a substance at constant pressure represents the fractional change in its density as temperature varies. When a substance is heated, its volume typically increases while its mass remains constant, leading to a decrease in density. This relationship is mathematically defined as the relative change in volume per unit change in temperature, which directly correlates to how the substance's density shifts in response to thermal energy. In many fluids and solids, this coefficient is used to predict how much the material will expand or contract, thereby altering its concentration of mass per unit volume.
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