Question

Who is What is fog? How is it formed?​

Answer 1

Answer:

Fog is often described as a stratus cloud resting near the ground. Fog forms when the temperature and dew point of the air approach the same value (i.e., dew-point spread is less than 5°F) either through cooling of the air (producing advection, radiation, or upslope fog) or by adding enough moisture to raise the dew point (producing steam or frontal fog). When composed of ice crystals, it is called ice fog.

Formation of Fog:

Fog forms by increasing moisture and/or cooling the air.

Moisture is increased by the following:

• Precipitation.

• Evaporation from wet surfaces.

• Moisture advection.

Cooling of the air results from the following:

• Radiational cooling.

• Advection over a cold surface.

• Upslope flow.

• Evaporation.

Answer 2

Fog shows up when water vapor, or water in its gaseous form, condenses. During condensation, molecules of water vapor combine to make tiny liquid water droplets that hang in the air. You can see fog because of these tiny water droplets. Water vapor, a gas, is invisible.