Can fog form underwater?

' fog' is something called a colloid. A colloid is something that is dispersed but not dissolved or mixed in a chemical way. If the suspended particle is small enough it can stay in suspension for a long time without settling out. read more

You can't get smoke either, unless solid particles are suspended in steam underwater, like in volcanic activity. It will always be an emulsion in a liquid not a fog. An interesting test for a colloid is that it will show a light beam. read more

Every sailor fears fog in all its various forms. Given the choice, most sailors would probably prefer to be caught out in strong winds than a thick fog. At least with strong winds, given the sea room, you can heave-to. Caught out in fog there really is no safe haven. read more

Three main reasons the fog can form: 1) Radiation fog (the most common). At night, the heat from the day is radiating back in space as infrared. It gets colder near the ground and that forms a thermal inversion: cold air under warmer one. As the temperature reaches under dew point, condensation occurs, first as haze then, fog. 2) Advection fog. read more