brooksmoses: (Two)
brooksmoses ([personal profile] brooksmoses) wrote2022-01-15 07:15 pm

Atmospheric pressure trivia.

It is a source of annoyance that nominal atmospheric pressure at sea level in metric units is about 101 kPa, or 1.01 bar in informal metric units, rather than being equal to a nice round "one bar".

However, today I discovered that -- making allowances for imprecision of topographical maps of Paris and of interpolating on atmosphere-vs-altitude charts -- the nominal atmospheric pressure at the International Bureau of Weights and Measures in Paris is, in fact 100 kPa to at least three digits of precision.

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