Question 16.8: Mixing hot and cold water Clearly, mixing hot and cold water...
Mixing hot and cold water
Clearly, mixing hot and cold water is an irreversible process. If equal amounts are mixed, the final temperature of the system is the average of the two starting temperatures. Suppose 1.00 kg of water at 100°C is placed in thermal contact with 1.00 kg of water at 0°C. Eventually the system will equilibrate at 50°C. In this example, we will calculate the approximate change in entropy just after they are mixed, when the hot water has only cooled to 99°C and the cold water has warmed to 1°C. We will assume that the specific heat of water is constant at 4190 J/(kg · K) over the given temperature range.
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