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t₁ = 20 C
m₂ = 20 kg
t₂ = 80 C
tm = ?
korzystamy z zasady bilansu cieplnego:
Q₁ = Q₂
m₁ * cw *Δt₁ = m₂ * cw*Δt₂ /:cw
m₁ *Δt₁ = m₂ *Δt₂
m₁ * (tm - t₁ ) = m₂ * ( t₂ - tm)
m₁tm - m₁t₁ = m₂t₂ - m₂tm
m₁tm + m₂tm = m₂t₂ + m₁t₁
tm ( m₁+ m₂) = m₂t₂ + m₁t₁
t_m = 60 C