Fog
a very thick mist; small hollow but so low as to be but a short distance vesicles of water suspended in the air, from the earth in place of rising high above it and becoming so illuminated by the sun as to constitute clouds of varied hue. Fogs often arise when the air above are then condensed by coming in contact warm, moist soil is colder than the soil itself. The hot vapors from the ground cold air of a room. But no fog arises till with the colder air above, as the warm the cold air has absorbed vapor enough steam of a kettle is by the comparatively to bring it to the point of saturation, Fogs often hang over rivers. Their cause is the condensation by contact with the cold water, of the vapor in a hot and moist air current passing over the river.