RELATIVE AIR PRESSURE
Relative air pressure is the same as the barometric pressure.
combination of the absolute air pressure and the altitude.
The calculation of relative air pressure is a
ABSOLUTE AIR PRESSURE
Absolute air pressure is the actual air pressure on the barometer without regard to altitude.
INCHES OF MERCURY (inHg)
Inches of Mercury are the common unit of measurement for air pressure in the United States.
HECTOPASCALS (hPa)
Hectopascals are the common units of measurement for air pressure in the International System (SI) of
measurement. The hectopascal holds the same value