Temperature of cold water in calorimeter, T1=30∘C,m1=0.5kg=500g Temperature of hot water, T2=60∘C, m2=0.3kg=300g Resulting temperature, T3=40∘C Let water equivalent of the calorimeter is W‌gram ‌. According to principle of calorimetry. Heat lost by warm water = Heat gained by cold water + Heat gained by the calorimeter