What happens to water vapor in ice fog conditions?

In ice fog conditions, the temperature is typically well below freezing, and the air can hold very little moisture. Under these circumstances, water vapor present in the air does not remain as a gas. Instead, it undergoes a process known as deposition, where it transforms directly from a gaseous state to solid ice crystals. These ice crystals form tiny particles in the atmosphere, creating the visual phenomenon known as ice fog.

This process occurs because the atmospheric conditions are conducive to rapid freezing, and the minute ice crystals that result can stay suspended in the cold air, leading to reduced visibility and a fog-like appearance. Therefore, the proper understanding of ice fog is that water vapor directly freezes into ice crystals under such frigid conditions.