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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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drelog drelog
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8 years ago
You might wonder why a millibar isn't exactly 1/1000th of an atmosphere.  The unit is actually related to the old CGS units because atmospheric pressure is close to this unit.  In CGS units 1 bar = 1000 dynes/cm2.  Pressure is often incorrectly reported as kg/cm2, which is neither a legitimate pressure unit nor a standard SI unit (pressure is force/unit area, and kg are a mass unit, and SI units never mix kg and cm).  So let's straighten out your friends on these units.  Standard air pressure in this incorrect unit is 1.034 kg/cm2.  The weight of a kg at the earth's surface is 980,000 dynes.  So what is standard air pressure in millibars?
A) 890 mb
B) 1143 mb
C) 1013 mb
D) 750 mb
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Earth Science

Earth Science


Edition: 14th
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PulsaPulsa
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8 years ago
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drelog Author
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#2
8 years ago
Double checked your answer with my friend, it's right Smiling Face with Open Mouth
ןnɟʎoɾ sʎɐʍן∀ Slight Smile
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