Preferred Label : visibility;
Detailed label : visibility in atmospheric chemistry;
IUPAC definition : 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.;
Origin ID : V06631;
See also
- See also inter- (CISMeF)
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.
