q Pascal (Pa): a SI (Systeme
Internationale) unit for air pressure.
q 1 Pa = a force of 1 newton acting on a
surface of one square
q meter
q 1 hectopascal (hPa) = 1 millibar
(mb) [hecto = one hundred
=100]
qBar: a more popular
unit for air pressure.
q 1 bar = a force of 100,000 newtons acting
on a surface of one
q square meter
q = 100,000 Pa
q = 1000 hPa
q = 1000 mb
qOne
atmospheric pressure = standard value of atmospheric pressure at lea level =
1013.25 mb = 1013.25 hPa.