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0,11 : 90 =
0,12
l₀= 100cm= 1m
Δl=0,11cm= 1,1×10⁻³m
Δt=90°C
dit=α
Jwb=
Δl=l₀.α.Δt
1,1×10⁻³=1.α.90
1,1×10⁻³=90α
α=1,23×10⁻⁵/°C