![]() ![]() 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. Water vapor, a gas, is invisible.įog happens when it’s very, very humid. 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. 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.įog shows up when water vapor, or water in its gaseous form, condenses. In some conditions, fog can be so thick that it makes passing cars. Fog can be thin or thick, meaning people have difficulty seeing through it. ![]()
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