How can water be 0°C or colder without being frozen? Assuming there are no impurities.
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There are two freezing temperatures in reality, the first is the temperature at which water will freeze (under atmospheric conditions) in the presence of a seed crystal or nucleation site for a crystal to form. The second is the temperature at which something called crystal homogenous nucleation is reached, which for water under the conditions we’re talking about is around -48C.
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