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Homework Statement
I want to find the mathematical proof to show that the density of an object changes with thermal expansion. My professor showed this in class and it was horribly wrong because he let a few things out. The book I'm reading showed it in 4 steps and left out a lot of the crucial parts. I've been working on this for a few days.
How do I go from, Δρ=m/ΔV, to Δρ/ρ= -3(ΔL/L) ?
I think these are the relevant equations:
V=(1+βΔT)Vi
L=(1+αΔT)Li
V=m/ρ
The Attempt at a Solution
This is how I got it but I don't think it's correct: m.imgur.com/a/ZOfCp