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