by a barometer
It is measured in inches of Mercury, millibars, and hectoPascals.
It is measured in inches of Mercury, millibars, and hectoPascals.
Those are (somewhat outdated) pressure units.
inches in mercury and millibars Barometers .
pressure
pressure
Air pressure is measured in bar.
Air pressure is the force exerted on an object or area by the weight of the surrounding air particles.Air pressure is measured by Barometer.
with a barometer
Millibars
negative pressure is measured in negative inches of mercury
vacuum is measured in pressure. To get a vacuum you need a negative pressure. that would be inches of mercury hg