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ghiata absoarbe caldura Q abs = m2·λ+m2cΔt2 (Δt2 = 20° - 0°)
m1c1Δt1 =m2(λ + cΔt2) (c = caldura specifica a apei, λ= caldura latenta de topire a ghietii)
m2 = m1c1Δt1 /(λ + cΔt2)