Sebanyak 4 gram air bersuhu 15°c di campur dg 6 gram air bersuhu 70 °c. Jika kalor jenis air 1kal/g°c suhu campuran sebesar

azas black
Q1=Q2
M1.C.∆t1 = M2.C.∆t2
coret C
M1. ∆t1 = M2.∆t2
4. (x-15) = 6.(70-x)
2 (x-15) = 3 (70-x)
2x-30 = 210-3x
5x = 240
x = 48°C
jadi suhu campuran 48°C