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

Q lepas = Q terima
m1.c.∆T = m2.c.∆T
6.1.(70-Tc) = 4.1.(Tc-15)
6.(70-Tc) = 4.(Tc-15) *dikali
420-6Tc = 4Tc-60
420+60 = 6Tc+4Tc
480 = 10Tc
Tc = 480/10
= 48°c

NB: Tc itu suhu campuran

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