![]() ![]() Who was the first person to use a barometer to measure differences in altitude. The unit is named after Blaise Pascal (1623 - 1662), French philosopher and mathematician, Air pressure is also measured in hectopascals (hPa), Psi is a pressure unit and equals the force of one pound applied. 1 One newton is therefore the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force. Thus pressure is moreĬommonly measured in kilopascals (kPa), with 1 kPa = 0.145 lbf/in 2. Pascal is the unit of pressure in the metric system and is equal to 1 newton per square meter. Definition A newton is defined as 1 kgm/s 2 (it is a derived unit which is defined in terms of the SI base units ). Terms a pascal is only 0.000 145 pounds per square inch (0.020 885 lbf/ft 2 or 0.007 50 mmHg). Sounds impressive, but in traditional English Per square meter or one "kilogram per meter per second per second." Values in "standard atmosphere" Elevation Temperature Air PressureĪir pressure depends on temperature and indirectly on altitude Pascal (Pa) is the metric SI unit of pressure and the standard pressure unit in the MKS metric system, equal to one newton Pressure, temperature and standard height (altitude or elevation) Pressures of several gigapascals can convert graphite to diamond or make hydrogen a metallic conductor. Such high pressures are rarely encounterd. The prefix "kilo" means "1,000", so one kilopascal = 1,000 Pa.
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