Which type of fog results from a difference in temperatures between the air and the water surface?

Steam fog occurs when cold air moves over a warmer body of water. The warmer water evaporates into the cooler air, saturating it, which leads to the condensation of water vapor into tiny droplets, creating fog. This phenomenon typically happens when the water surface temperature is significantly higher than the surrounding air temperature, causing a noticeable difference that results in the formation of fog.

In contrast, frontal fog usually develops when warm air rises over a cooler surface, while ice fog is seen in extremely cold temperatures when water vapor freezes in the air. Upslope fog occurs when moist air is pushed up a slope, cooling it as it rises, which is different from the interaction between air and water surface temperatures that defines steam fog.