Fog that is said to “burn off” in the morning sun is radiation fog. Ground fog does not reach as high as any of the clouds overhead. Sometimes people use the term “ ground fog” to refer to radiation fog. As heat is transferred from the ground to the air, water droplets form. Radiation fog forms in the evening when heat absorbed by the Earth’s surface during the day is radiated into the air. Types of Fog There are several different types of fog, including radiation fog, advection fog, valley fog, and freezing fog. Mist can reduce visibility to between one and two kilometers. Fog cuts visibility down to one kilometer, meaning it will prevent you from seeing further away than one kilometer from where you’re standing. There are more water molecules in the same amount of space in a fog. This means fog is more massive and thicker than mist. Depending on the humidity and temperature, fog can form very suddenly and then disappear just as quickly. Sea fog, which shows up near bodies of salty water, is formed as water vapor condenses around bits of salt. Water vapor con denses around these microscopic solid particles. In order for fog to form, dust or some kind of air pollution needs to be in the air. There has to be a lot of water vapor in the air for fog to form. You can see fog because of these tiny water droplets.
During condensation, molecules of water vapor combine to make tiny liquid water droplets that hang in the air. Fog shows up when water vapor, or water in its gaseous form, condenses.
Even monuments like London Bridge, in London, England, or the Golden Gate Bridge, in San Francisco, California, are almost impossible to see in thick fog. In some conditions, fog can be so thick that it makes it hard to drive safely because it obscures the road and other cars. Fog can be thin or thick, meaning people have difficulty seeing through it.
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