119
TERM
DESCRIPTION
between 0% and 100%.
INCHES OF MERCURY (inHg)
This is the common unit of measurement for
air pressure in the United States. It refers to
the length of a standard column of mercury (a
liquid metal) that can be pushed up by the
ambient air pressure. Standard pressure is
approximately 29.92 inHg
KNOTS (kn)
One knot is equivalent to one nautical mile and
is sometimes used to indicate wind speed.
LCD
An acronym for “Liquid Crystal Display.” This is
a common type of display screen used in
televisions, computers, watches, and digital
clocks.
LUX (lx)
The unit of illuminance (
a measure of the
intensity of illumination on a surface
) as used in
the SI system.
MILLIBAR (mb)
See HECTOPASCALS.
MM OF MERCURY (mmHg)
This is similar to 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.
