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Phase behaviour of water
Water is one of the most well-studied substances in the physical sciences. This is not surprising in the light of its importance to our everyday lives, and indeed to life itself. Water is the only common substance that appears in all three basic states of matter – vapour, liquid and solid – under everyday conditions. Solid water has an especially large number of polymorphs, although some only appear at very high pressures that are not easily accessible to experiment.