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Atmospheric Chemistry Glossary Definition (English)
Visibility Defined
The following is in context to Atmospheric Chemistry, because it's common for a single word to have multiple meanings you will find additional research links near the bottom of the page.
"Defined as the greatest distance at which a black object of suitable dimensions can be seen and recognized against the horizon sky, or, in the case of night observations, could be seen and recognized if the general illumination were raised to the normal daylight level. The criterion of recognizing the object, not just seeing the object without recognition, is used. Transmissometers, telephotometers, and sun photometers are devices used to measure the degree of transmission of light. Nephelometers (integrating) are used to measure visibility by way of the light scattering from aerosols in the air mass."
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