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How to Supercool Water
Posted by Martin Nikiforidis
One of the interested facts about water is that it does not always freeze and 273.15 K, as it normally does. Actually pure water, water that has no impurities and free of nucleation sites, can stay in liquid form up to 224.8 K.
When the purer water is supercooled it is very easy to freeze it, because any iteraction with the water molecules in that state can result in the fomration of nuclation sites, that will instantly result in the freezing of the water.
This video is a simple and nice representation on how to supercool water and then freeze it instantly!