I believe this value was the average for several weather stations corrected to sea level in temperate latitudes, eg. US and Europe, over an entire year.
A. Toussaint of France had a model in 1920. NACA report 147 "Standard Atmosphere" was written by Willis Ray Gregg in 1922. The most commonly used model is the Air Force's ARDC 1959 Standard Atmosphere. Above from "Introduction to Flight", John D. Anderson, Jr, McGraw-Hill, 1978. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Pat Naughtin Sent: 21 April 2004 15:45 To: U.S. Metric Association Subject: [USMA:29598] Re: Air pressure history Dear Mike, No, I had no response. As you can see, I have reposted this to the USMA list. Maybe someone there can help this time. Cheers, Pat Naughtin LCAMS Geelong, Australia -- on 2004-04-21 23.11, Michael Payne wrote: > Did you ever get an answer to this Pat? > > Mike Payne > > >> [Original Message] >> From: Pat Naughtin <[EMAIL PROTECTED]> >> To: U.S. Metric Association <[EMAIL PROTECTED]> >> Date: 18/7/03 10:33:26 >> Subject: [USMA:26410] Air pressure history >> >> Dear All, >> >> Does anyone know the history of 'standard' air pressure of 29.92 >> inches of mercury (inHg) or 760 millimeters of mercury (mmHg). >> >> When I looked at the values that have been used previously I found: >> One atmosphere of pressure is equivalent to: >> 760 millimeters of mercury >> 29.92 inches of mercury >> 14.7 pounds per square inch (psi) >> 1013.25 millibar (mb) >> 34 feet of water (approximately 10 meters of water) >> >> Thinking that the 'standard' air pressure might be a mid-point >> between high and low pressures, I investigated to find that: >> The lowest air pressure recorded at sea level was 87 kilopascals, and >> the highest air pressure recorded at sea level was 108.4 kilopascal, >> but the mid-point between these values is 97.7 kilopascals, and this >> doesn't seem to fit with any of the previously used 'standard' values. >> >> I then thought that 10 metres of water might be a clue. Taking the >> standard value of acceleration due to gravity (g) as 9.806 65 metres >> per second squared, I found that the pressure below 10 metres of >> water is about >> 98 kilopascals, so I had no luck there either. >> >> Can anyone help with the history of 'standard' air pressure? >> >> Thanks, >> >> Pat Naughtin LCAMS >> Geelong, Australia
