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What is the unit of coefficient of area expansion?(a) per °C(b) °C(c) per (°C)^2(d) (°C)^2The question was posed to me during an interview for a job.Question is taken from Thermal Expansion topic in chapter Thermal Properties of Matter of Physics – Class 11

Answer»

The CORRECT ANSWER is (a) per °C

Explanation: The coefficient of area expansion is defined as (ΔA/A)/ΔT. So we see that its unit is per °C. Note that all the coefficients of THERMAL expansion, NAMELY LINEAR, area & volume have the same unit.



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