Atmospheric Pressure: The pressure exerted by the atmosphere at a given point. Its measurement can be expressed in several ways. One is in millibars. Another is in inches or millimeters of mercury (Hg).

 

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Atmospheric Pressure: The pressure exerted by the atmosphere at a given point. Its measurement can be expressed in several ways. One is in millibars. Another is in inches or millimeters of mercury (Hg).

Constant Pressure Chart: A chart of a constant pressure surface in which atmospheric pressure is uniform everywhere at any given moment. Elements may include analyses of height above sea level, wind, temperature, an . . . View Full Definition

Pressure Sensor: A pressure transducer sensing de-vice for water level measurement. A relative transducer is vented to the atmosphere and pressure readings are made relative to atmospheric pressure. An absol . . . View Full Definition

Constant Pressure Surface: A surface along which the atmospheric pressure is equal everywhere.

Sea Level Pressure: The atmospheric pressure at mean sea level, usually determined from the observed station pressure.

Station Pressure: The atmospheric pressure with respect to the station elevation.

Central Pressure: The atmospheric pressure at the center of a high or low. It is the highest pressure in a high and the lowest pressure in a low, referring to the sea level pressure of the system on a surface chart.

Pressure Jump: A sudden increase in the observed atmospheric pressure or station pressure.

Atmospheric-Automatic Inlet Valve (AIS): System used on early engines in which the inlet valve is held shut by a weak spring and opens by atmospheric pressure when the falling piston creates a vacuum in the cylinder.

Vapor Pressure: The pressure exerted by the molecules of a given vapor. In meteorology, it is considered as the part of total atmospheric pressure due to the water vapor content. It is independent of other . . . View Full Definition