tendency_of_surface_air_pressure
https://w3id.org/hacid/data/cs/variables/cf/tendency_of_surface_air_pressure <https://w3id.org/hacid/onto/data/Variable>
The surface called "surface" means the lower boundary of the atmosphere. "tendency_of_X" means derivative of X with respect to time. Air pressure is the force per unit area which would be exerted when the moving gas molecules of which the air is composed strike a theoretical surface of any orientation.
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tendency_of_surface_air_pressure