Air bermasa 2kg dgn suhu 20ºC dpanaskan dgn kalor sebesar 504kJ. Jika kalor jenis air 4200j/kgºC , maka suhu akhirnya adlh
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504000 = 2. 4200 (T2-20)
504.000 = 8400 T2 - 168000
8400 T2 = 336000
T2 = 40
jadi suhu akhirnya 40 derajat celcius