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Check this site: http://cougar.slvhs.slv.k12.ca.us/~pboomer/physicslectures/ch8coefficientexpansion.html
Note: Brass's coefficient of expansion is 19.3 X 10^-6 and iron's 12.1 X 10^-6. This means that an iron cannonball that is 4" at 10°C is going to measure 3.999032" at -10°C. If it is in a 3" brass hole, that hole will shrink from 3" at 10°C to 2.998842" at -10°C . This is close enough to not shrinking for me.
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