"Not only is it extremely hot out there, but for the last half an hour the barometric pressure has been dropping and the wind speeds have increased significantly."
―A Hologram of Rodney McKay[src]

Atmospheric pressure is the force per unit area exerted against a surface by the weight of air above that surface in the Earth's atmosphere. It is measured by a barometer, hence it is called Barometric pressure. In an alternate timeline, where Lt. Colonel John Sheppard traveled 48,000 years into the future, a Hologram of Dr. Rodney McKay told him that the barometric pressure outside had dropped and the winds were getting stronger indicating that a violent storm was coming. (SGA: "The Last Man")

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