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units of measurement on altimeters
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March 7th 04, 04:18 PM
Jukka K. Korpela
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(Pat Norton) wrote:
Do all commercial aircraft that fly in and out of North America have
dual unit altimeters (hPa and inHg)?
I don't know about that, but as regards to the metric system, I would
like to mention that using hPa is _not_ the recommended way. Although
the "h" prefix is formally part of the SI system, it's regarded as
unsuitable by many, including NIST.
In practice, using hPa means being just _nominally_ metric, i.e. using
actually millibars but under a different name. The odd thing is that
the correct kPa would be more practical.
--
Yucca,
http://www.cs.tut.fi/~jkorpela/
Jukka K. Korpela