Dispersed phase and dispersion medium for fog are:

Liquid, gas

A colloid is a mixture of two or more substances in which one substance (the dispersed phase) is dispersed throughout another substance (the dispersion medium) in the form of very small particles. The particles in a colloid are typically between 1 nanometer (nm) and 1000 nm in diameter. This is small enough that the particles do not settle out of the dispersion medium, but large enough that they do not dissolve.

Fog is a colloidal dispersion of liquid in gas. The dispersed phase in fog is water droplets, and the dispersion medium is air. The water droplets in fog are typically between 0.01 and 0.1 micrometers in diameter.

Fog is formed when water vapor in the air condenses into liquid water droplets. This can happen when the air cools, or when it comes into contact with a cold surface. Fog is often seen in the early morning, when the ground has cooled overnight and the air temperature is still relatively warm.

Fog can also be formed by human activities, such as the burning of fossil fuels. When fossil fuels are burned, they release water vapor and other pollutants into the air. These pollutants can act as condensation nuclei, which are particles that water vapor can condense on.

Fog can be a hazard to aviation and shipping, as it can reduce visibility. It can also be a nuisance to people who live in areas that are prone to fog. However, fog can also be beneficial. For example, fog can help to reduce air pollution and trap moisture in the soil, which can be helpful for agriculture.

Here is a diagram of a fog colloid:

The water droplets in the fog are represented by the small blue spheres. The air molecules are represented by the smaller, red spheres.

Fog is a type of aerosol, which is a colloid in which the dispersed phase is a liquid or solid and the dispersion medium is a gas. Other examples of aerosols include smoke, dust, and mist.