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t₁= 26°c
t₂= 90°c
Δt=t₂-t₁
Δt= 64°c
A₀= 15×10 cn²
A₀=150 cm²= 1,5×10⁻² m²
α= 0,000011/°c= 1,1×10⁻⁵/°c
β= 2α= 2,2×10⁻⁵/°c
Dit= At
Jwb=
At= A₀(1+β.Δt)
At= 1,5×10⁻²(1+2,2×10⁻⁵.64)
At= 1,5×10⁻²(1+1,408×10⁻³)
At=1,5×10⁻²+2,112×10⁻³
At= 0,017 m²
At=170 cm²