Science · 6 pages · 12 min

How fog differs from a cloud on the ground

Fog is a ground-level cloud, named for where it sits and how far you can see.

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From the opening

Fog is a cloud whose base is on the ground, a crowd of tiny water droplets in the air you walk through. It differs from a cloud overhead in location and usually in how the air was cooled, not in what the droplets are made of. The opening covers why the droplets match a cloud, how night cooling makes radiation fog, and what advection fog needs.

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Inside

Why the droplets match a cloud
How night cooling makes radiation fog
What advection fog needs
Why visibility names the thickness
Where the idea stops applying
A distinction worth keeping

Sources

Fog as a cloud with its base at the ground
Saturation by radiative cooling or by moving over a cold surface

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How fog differs from a cloud on the ground

From the opening

Inside

Sources

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