# Barometric Pressure

I have been studying the reduction in barometric pressure and temperature with height and am happy with my findings ref temperature.

With regard to pressure I read that for every increase in altitude of 32 feet the pressure drops 1 mb. For every increase in height of 1000m the pressure drops 100 mb. These figures do not actually tally with each other.

Additionally when you consider this in comparison with the average barometric pressure on top of Everest, nothing makes sense.

Anyone any ideas?

Mike.

With regard to pressure I read that for every increase in altitude of 32 feet the pressure drops 1 mb. For every increase in height of 1000m the pressure drops 100 mb. These figures do not actually tally with each other.>>

32 feet is about ten meters, 1000 m is one hundred times that. Why do you not think theses figures tally?

As an aside, atmospheric pressure changing with altitude, re: the rules of thumb, include temperature. And, the drop in pressure is NOT linear. The rule of thumb you cited is ROUGH. A better correction is 8mbar per 1000m. At Everest peak, 10Km, that would mean a pressure drop of 800mb, or a pressure of 200mb, which is in the ballpark. The problem is, the drop in pressure with altitude is NOT linear, and in fact, there are temperature differences also.

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