Visibility in dense fog100 m
333Bread loaves
625Kindle heights
41.7 trillionElectron wavelengths
Dense fog threshold
Photo from Wikimedia Commons
Fog Bank
A low-lying cloud that reduces visibility to near zero/Weather & Climate
A fog bank is essentially a cloud that forms at ground level, reducing horizontal visibility to under 1,000 meters by definition (under 100 meters for dense fog). A typical fog bank covering 10 square kilometers contains only about 500 kilograms of suspended water -- remarkably little for something that can shut down airports and cause multi-car pileups. The water droplets are so tiny (2 to 50 micrometers) that they remain suspended in the air, turning the world into a soft-focus photograph that is far more dangerous than it looks.
Measurements
Typical coverage area10 million m^2
154 millionLicense plates
50,000Movie screens
29.4Disneylands
10 square kilometers
Suspended water mass500 kg
25.1Curling stones
43,478AAA batteries
For a typical 10 km^2 fog bank
Water droplet diameter10 millionths m
8.1 trillionthsCalifornia lengths
4.2 millionElectron wavelengths
10 micrometers typical