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 = 1,000 hPa
q = 1,000 mb
qOne
atmospheric pressure = standard value of atmospheric pressure at lea level =
1013.25 mb = 1013.25 hPa.