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c tidak diketahui dianggap sama maka
m₁ = 200 gr = 1/5 kg
T₁ = 40'C
m₂ = 10 gr = 1/100 kg
T₂ = 100'C
maka
m₁ . c . ΔT₁ = m₂ . c . ΔT₂
1/5 . ( T - 40 ) = 1/100 . ( 100 - T )
1/5T - 8 = 1 - T
1/5T + T = 8 + 1
6/5 T = 9
T = 9 : 6/5
T = 9 x 5/6
T = 45/6
T = 7,5 °C