Aercus Instruments™
- WeatherMaster
93 |
P a g e
TERM
DESCRIPTION
in the SI system.
MILLIBAR (mb)
See HECTOPASCALS.
MM OF MERCURY
(mmHg)
This is like inches of mercury, except
expressed in millimeters. Standard pressure is
approximately 760 mmHg.
NIST
National
Institute
of
Standards
and
Technology. A United States institute that
keeps very accurate time using atomic clocks
and provides and internet-based service to
accurately set device clocks.
RELATIVE AIR
PRESSURE/
RELATIVE BAROMETRIC
PRESSURE
Relative air pressure is the absolute air
pressure compensated for the altitude of the
barometer. The result is what the air pressure
would be at sea level.
ULTRA VIOLET INDEX
The ultraviolet index or UV-Index (UVI) is an
international standard measurement of the
strength of sunburn-producing ultraviolet (UV)
radiation at a particular place and time. The
purpose of the UV Index is to help people
effectively protect themselves from UV
radiation. The UV Index is a linear scale, with
higher values representing a greater risk of
sunburn (which is correlated with other health
risks) due to UV exposure. An index of 0
corresponds to zero UV radiation, as is
essentially the case at night. An index of 10
corresponds roughly to midday summer
sunlight with a clear sky when the UV Index
was originally designed, but values above 10
are sometimes possible. Levels above 8 are
