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Why is it that a tub of water placed in a farmers canning cellar helps prevent canned food from freezing in cold winters?
Veh001
Ice is a good insulator - it does not conduct thermal energy well. A layer of ice can (rather counter intuitively) keep a cellar warmer than the cold winter outside, if the winter weather is well below the freezing point. This is the same principle that keeps rivers and lakes from freezing all the way through in winter weather.
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