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ΔT = 90-20 = 70
Rumus muai volum = 1 + (3.α.ΔT)
Konstanta = 3.α = 14,3.10⁻⁶ . 3
m = m
ρ . vol =ρ . vol
19,3 (1) = ρ . 1(1+14,3 . 10⁻⁶ . 3 . 70)
19,31 = ρ (1 + 3003. 10⁻⁶)
19,31 = ρ . (1+3,003 . 10⁻³)
19,31/ (1+3,003.10⁻³) = ρ
19,042 g/cm³ = ρ
^_^