The unit of coefficient of linear expansion or volume expansion is__________?
Correct answer: B. K-1
- A. K
- B. K-1
- C. K -2
- D. none
Explanation
The coefficient of linear expansion is α = change in length/(original length x change in temperature), so its unit is 1/K, written K^-1. The same reasoning gives K^-1 for the coefficient of volume expansion. The likely mistake is choosing K, but the temperature unit appears in the denominator.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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