Math CentralQuandaries & Queries


Question from roshni, a student:

Coefficient thermal expansion of steel is 0.00000645/in/in/deg F if F was C(Celsius) then what is the answer

One degree C is exactly 9/5 = 1.8 degree F.

Thus the answer is 0.00001161/(deg C). (You may omit the length unit unless you want (say) to plug in length in feet and get back expansion in millimeters.)

There is probably enough variation between steels that both these numbers are overprecise; I suspect that 0.000012/(deg C) claims the actual appropriate precision.


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