Related Words

Horizontal Pressure Gradient Force: The horizontal component of the product of the specific volume and the rate of decrease in pressure with distance.

Pressure Altitude: The altitude in standard atmosphere at which a given pressure will be observed. It is the indicated altitude of a pressure altimeter at an altitude setting of 29.92 inches of mercury, and is . . . View Full Definition

Pressure Change: The net difference between the barometric pressure at the beginning and ending of a specified interval of time, usually the three hour period preceding an observation.

Pressure Altimeter: An aneroid barometer calibrated to indicate altitude in feet instead of units of pressure. It is read accurately only in a standard atmosphere and when the correct altimeter setting is used.

Pressure: The force per unit area exerted by the weight of the atmosphere above a point on or above the earth's surface.

Osmotic Pressure: Pressure generated by water moving by osmosis into or out of a cell.

Positive Reinforcement: The process of acknowledging specific behaviors with positive feedback, such as a smile, praise or reward.

Pressure Characteristic: The pattern of the pressure change during the specified period of time, usually the three hour period preceding an observation. This is recorded in three categories: falling, rising, or steady.

Pressure Gauge: A water level gauge that is operated by the change in pressure at the bottom of a body of water due to the rise and fall of the water level. See gas purged pressure gauge.

Pressure Relief Valve: A valve used on hot water heating appliances to help keep the pressure in the heated tank or boiler from getting too high by allowing the relief of pressure from the valve.