(at-mos-fer’-ik) Pertaining to the atmosphere. A. Moisture, the vapor of water mingled with the atmosphere. It varies in quantity according to the temperature. A. Pressure Cavity, a cavity formed on the palatine surface of a set of artificial teeth to retain them in the mouth. A. Tension, the pressure of the air per square inch on the surface of a body. Normally, at the sea level it is about 14.7 lbs. per square inch, or equal to that of a column of mercury about 30 in. in height. It decreases about in., or lb. per square inch for every 90 fe

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Definition of  ATMOSPHERIC