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While ice at standard pressure will melt zero degree C, water can sometime be cooled below this temperature and remain a liquid. This is an example of supercooling. Liquid water in this state is unstable. Ice formation can be nucleation site. As the ice forms, the temperaturre will increase due to the latent heat of the ice water transition of 80 calories/gram.
Video by Christine Hanson
Demo Description by Dr Steven W. McCauley