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Should it have pi in
The π cancels out if you're minded to go about it that way. Convert the OD to a circumference by multiplying by π, calculate linear increase in circumference, convert that back to a diameter increase by dividing by π
gbj_tester-
Thanks. My paper doodling was getting messy lol
I remember the example in the link below about adding a metre to a piece of string around the earth from school lol
https://jumk.de/math-physics-formulary/increase-in-circumference.php
midlife
Is it the coefficient of linear expansion thing I did at A level? Should it have pi in or somewhere as its a radius thing, now my head is hurting lol