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Bar = ? psi


Mole

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Atmospheric pressure varies by a few percent depending on the weather. When they say the pressure is 1000 they mean 1000 millibars, ie 1 bar.

 

"low pressure" is anything less than average atmospheric pressure, and high anything above it. I guess the variation is about plus/minus 30 mb? So using Lawrence's numbers low is less than about 986 and high is above 986.

 

The metric unit is the pascal (i kg per square metre) so there are approx 100,000 of those at atmospheric pressure. (I think 1 bar is actually defined at 101325 Pa)

 

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