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steam fog[′stēm ‚fäg]
Fog formed when water vapor is added to air which is much colder than the vapor's source; most commonly, when very cold air drifts across relatively warm water. Also known as frost smoke; sea mist; sea smoke; steam mist; water smoke.
A type of fog that occurs on water surfaces and appears as steam or condensed water vapor. This type of fog is formed when very cold air passes across a warmer water surface and mixes with the warm air there. For the fog to occur, the temperature should be low—usually around the freezing point or lower—and there should be a marked inversion in the air before it moves over the water.