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.