Fog is often described as a cloud that forms at ground level. In what ways are the formation of fog and clouds similar and different?
What will be an ideal response?
ANSWER: Fog and clouds form in the same way, either by: (1) cooling—air is cooled below its saturation point (dew point) or (2) evaporation and mixing—water vapor is added to the air by evaporation and moist air mixes with relatively dry air. Once fog forms it is maintained by new fog droplets, which constantly form on available nuclei. In other words, the air must maintain its degree of saturation either by continual cooling or by evaporation and mixing of vapor into the air. The differences between fog and clouds are that fog is a very local event and is found near the surface, whereas clouds form at considerable elevation and can be widespread.?
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What will be an ideal response?
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