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Q:

Is the atmospheric pressure measured in hectopascal, knots, isobar or millimeters?

A:

The international system of units defines pressure as being measured in Pascals. On Earth, standard atmospheric pressure is about 101 kPa (101,000 Pascal). 

 

A bar is not standard, but uses Pascals to define itself: one bar is 100,000 Pascals. (One bar is about the atmospheric pressure at sea level).

 

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