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The value of coefficient of thermal expansion is always the same for a material. True or False?(a) True(b) FalseThis question was posed to me in an interview for job.My query is from Thermal Expansion topic in division Thermal Properties of Matter of Physics – Class 11

Answer»

Right answer is (b) False

Best explanation: The coefficient of thermal expansion is constant over a range of TEMPERATURE, but is not always constant. It DEPENDS on temperature. For eg: the GRAPH of coefficient of volume expansion of copper with temperature is shown below.



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