Changing state
Preventing freezing in canning cellar A tub containing 50 kg of water is placed in a farmer’s canning cellar, initially at 10 °C. On a cold evening the cellar loses thermal energy through the walls at a rate of 1200 J/s. Without the tub of water, the fruit would freeze in 4 h (the fruit freezes at -1 °C because the sugar in the fruit lowers the freezing temperature). By what time interval does the presence of the water delay the freezing of the fruit?
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