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STEAM (0. Eng. steam, vapour, smoke, cf. Du. steam; the origin is unknown)
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STEAM (0. Eng. steam, vapour, smoke, cf. Du. steam; the origin is unknown), water-vapour. Dry steam is steam free from mechanically mixed water particles; wet steam, on the other hand, contains water particles in suspension. Saturated steam is steam in contact with liquid water at a temperature which is the boiling point of the water and condensing point of the steam; superheated steam is steam out of contact with water heated above this temperature. For theoretical considerations see VAPORIZATION, and for the most important application see STEAM ENGINE; also WATER.