Altimeters work off of atmospheric pressure readings, Pat. But the
readout is in terms of height above terrain. So assignments and reports
are always in length units. No human pressure to altitude correlation
procedures are used.
Jim
Pat Naughtin wrote:
Dear John, Jim, and All,
My understanding is that air craft actually measure pressure in
something like kilopascals and that this pressure measurement is then
changed (dumbed down ?) to a measure that implies that a measure of
length has been made somehow.
I suppose you could dangle a mass tied on a piece of string out the
window of the plane so that it drags along the ground, but it sounds
impractical!
By the way, some approximate conversions from pressure to height might
go something like this:
Pressure
Altitude
kilopascal
metres
100
0
90
1 000
80
2 000
70
3 000
65
4 000
60
5 000
45
6 000
40
8 000
22
10 000
19
12 000
15
14 000
10
16 000
7
18 000
4
20 000
3
25 000
1
30 000
Cheers,
Pat Naughtin
Author of the ebook, /Metrication Leaders Guide,/ that you can obtain
from http://metricationmatters.com/MetricationLeadersGuideInfo.html
PO Box 305 Belmont 3216,
Geelong, Australia
Phone: 61 3 5241 2008
Metric system consultant, writer, and speaker, Pat Naughtin, has helped
thousands of people and hundreds of companies upgrade to the modern
metric system smoothly, quickly, and so economically that they now save
thousands each year when buying, processing, or selling for their
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trades, crafts, and professions for commercial, industrial and
government metrication leaders in Asia, Europe, and in the USA. Pat's
clients include the Australian Government, Google, NASA, NIST, and the
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See http://www.metricationmatters.com
<http://www.metricationmatters.com/>for more metrication information,
contact Pat at pat.naugh...@metricationmatters.com
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On 2010/04/19, at 05:57 , John M. Steele wrote:
It is my understanding that European air space is controlled in feet.
The Wikipedia article on "flight level" shows a metric structure for
Russia, China, Mongolia, North Korea and various CIS States
(non-European former USSR satellites). Everybody else flies in feet
(I think).
------------------------------------------------------------------------
*From:* James R. Frysinger <j...@metricmethods.com
<mailto:j...@metricmethods.com>>
*To:* U.S. Metric Association <usma@colostate.edu
<mailto:usma@colostate.edu>>
*Sent:* Sun, April 18, 2010 3:13:10 PM
*Subject:* [USMA:47149] Air flight altitudes in meters
My impression had been that all air flight altitudes were given and
heeded in terms of feet. But this article implies flight altitudes in
meters.
http://www.foxnews.com/world/2010/04/17/european-skies-largely-remain-fly-zone/
Jim
-- James R. Frysinger
632 Stony Point Mountain Road
Doyle, TN 38559-3030
(C) 931.212.0267
(H) 931.657.3107
(F) 931.657.3108
--
James R. Frysinger
632 Stony Point Mountain Road
Doyle, TN 38559-3030
(C) 931.212.0267
(H) 931.657.3107
(F) 931.657.3108
