# The bath

The bath has water with a volume of 220 l and a temperature of 65°C. Determine the mass m2 of water at 15°C to be poured so that the resulting temperature of the water in the bath is 40°C. We neglect the heat exchange between water and the environment. The mass heat capacity of water is 4200 J/kg ∙ °C.

m2 =  220 l

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