ESS5
Prof. Jin-Yi Yu
Units of Atmospheric Pressure
q Pascal (Pa): a SI (Systeme Internationale) unit
for air pressure.
1 Pa = force of 1 newton acting
on a surface of one square meter
1
hectopascal (hPa) = 1 millibar (mb) [hecto = one hundred =100]
qBar: a more popular unit for air
pressure.
1 bar = 1000 hPa = 1000 mb
qOne atmospheric
pressure = standard value of atmospheric pressure at lea level = 1013.25 mb = 1013.25
hPa.