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So here in Albuquerque, our atmosphere pressure is somewhere in the £12.5 per square inch range. So this is when the plungers coming, Andy, Right here. These are only for teaching purposes.

Barometric pressure, or atmospheric pressure, is the weight of the earth’s atmosphere above us. Pressure varies on a day-to-day basis and by location. Pressure can change with temperature, as well.

Pioneering scientists discovered atmospheric pressure (also known as barometric or air pressure) in the 17th century, and determined a startling new fact -- that air actually has weight.

Pressure altitude is used to determine your aircraft’s performance in non-standard conditions, which are any time the barometric pressure is anything other than 29.92 Hg at sea level.