Orange farmers protect their crops during freezing temperatures by spraying water onto the trees and allow it to freeze. In terms of energy lost and energy gained, explain why this practice protects the oranges from damage.



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    The basic idea of freezing an orange tree is to conserve the heat inside the tree.  In actuality, spraying water onto the tree is not the only method to acheive this; in fact, it might be easier to look to other methods.  Covering the tree with a blanket and placing a lamp under the tree near the roots will provide a heat source throughout the cold temperatures (this is explained in more detail in the first link).  The second .pdf link explores a few different methods, and explains that freezing the tree by spraying water on it will “liberate” enough heat to preserve the tissue at 32ºF, however this requires constant water flow.

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