| Topic: |
Science > Physics |
| User: |
"Bouwman" |
| Date: |
04 Apr 2006 03:31:18 AM |
| Object: |
definition of pressure unit: bar |
Hi guys,
After an hour googling I could not find a definition of the ``bar''; the
pressure unit. There is a lot on conversions but nothing about a
historic definition.
thanks in advance, Peter
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| User: "CWatters" |
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| Title: Re: definition of pressure unit: bar |
04 Apr 2006 05:46:50 AM |
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"Bouwman" <pbouwman@planet.nl> wrote in message
news:MPG.1e9c4903576ea7659896b0@news.planet.nl...
Hi guys,
After an hour googling I could not find a definition of the ``bar''; the
pressure unit. There is a lot on conversions but nothing about a
historic definition.
http://en.wikipedia.org/wiki/Bar_(unit)
Quote: The bar and millibar were introduced by Sir Napier Shaw in 1909 and
internationally adopted in 1929
http://en.wikipedia.org/wiki/Napier_Shaw
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| User: "CWatters" |
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| Title: Re: definition of pressure unit: bar |
04 Apr 2006 06:04:29 AM |
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From a 1916 paper...
http://www.iop.org/EJ/abstract/1478-7814/31/1/324
"In the pressure scale the fundamental unit is the bar, the pressure due to
a million dynes per square centimetre. The practical unit is the millibar."
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| User: "SCW" |
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| Title: Re: definition of pressure unit: bar |
04 Apr 2006 03:55:47 AM |
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Bouwman wrote:
Hi guys,
After an hour googling I could not find a definition of the ``bar''; the
pressure unit. There is a lot on conversions but nothing about a
historic definition.
thanks in advance, Peter
It's probably from Greek - "Baros" is weight.
See http://www.thefreedictionary.com/bar
or
See http://dictionary.reference.com/search?q=bar
SCW
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| User: "Hexenmeister" |
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| Title: Re: definition of pressure unit: bar |
04 Apr 2006 02:53:22 PM |
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"SCW" <doune60@hotmail.co.uk> wrote in message
news:1144140947.529128.301540@j33g2000cwa.googlegroups.com...
[snip drunken rambling]
Androcles.
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| User: "Sam Wormley" |
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| Title: Re: definition of pressure unit: bar |
04 Apr 2006 08:20:03 AM |
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Bouwman wrote:
Hi guys,
After an hour googling I could not find a definition of the ``bar''; the
pressure unit. There is a lot on conversions but nothing about a
historic definition.
http://physics.nist.gov/cuu/Units/outside.html
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| User: "=?UTF-8?Q?Jeff=E2=80=A6Relf?=" |
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| Title: definition of pressure unit: bar |
11 Apr 2006 05:43:12 AM |
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Hi Bouwman, You asked about the history of the bar unit, see:
Wikipedia.ORG/wiki/Bar_(unit)
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| User: "John C. Polasek" |
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| Title: Re: definition of pressure unit: bar |
04 Apr 2006 09:04:33 AM |
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On Tue, 4 Apr 2006 10:31:18 +0200, Bouwman <pbouwman@planet.nl> wrote:
Hi guys,
After an hour googling I could not find a definition of the ``bar''; the
pressure unit. There is a lot on conversions but nothing about a
historic definition.
thanks in advance, Peter
bar is usually used in weather reports where 1000 millibars is
standard pressure = 14.7psi. For all I know, 1000 weather millibars
may be referenced to some local standard, such as high altitude
locations and thus be variable to a small extent.
In a hurricane or tornado pressure can drop to 900 or so millibars
that can cause roofs to blow off.
John Polasek
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