How does carved ice last so long without instantly melting?
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Most people imagine ice at 32f/0c degrees, because 32 is the freezing/melting point of ice, but the ice itself gets as cold as the freezer it is stored. A typical freezer is 0° F (-18° C).
So when removed from the freezer, the ice must first warm up enough, even to allow the outside to begin to melt. Air is also a poor thermal conductor. Throw the same sculpture in the pool and it would melt much faster, even if the water is cooler than the air.
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