[USMA:27832] RE: Airplane altitudes

[Mighty Chimp]

I’m still confused.  If the plane is not at 33 000 feet, then what altitude is it at?  I know you said it may vary to maintain the same pressure, but can we know what range of altitude the plane is actually at?   How did you come up with 33 000 ft = 26.2 kPa?    This is all quite interesting.   BTW, do you have proof of this?   Euric   -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Terry Simpson Sent: Saturday, 2003-12-13 19:02 To: U.S. Metric Association Subject: [USMA:27827] RE: Airplane altitudes   >Mighty Chimp >>The numeric value does not actually describe altitude, >>it describes the pressure of the air > >Are you saying that the plane isn't really at 33 000 ft   Yes, that is what I am saying. The phrase '33 000 feet' means 26 200 Pa.     >That the feet are units of pressure,   Yes (at cruise altitudes).     --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.551 / Virus Database: 343 - Release Date: 2003-12-11   --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.551 / Virus Database: 343 - Release Date: 2003-12-11