This is a mass of air that is moving upwards due to its warmth. The wind circulation around a low is counter-clockwise in the northern Hemisphere. Lows bring with them storm energies. They are also called troughs.
A mass of air that presses down only weakly on the surface of the Earth because it is being warmed and it therefore less dense
Water gauge pressure less than 0.1 MPa as defined by the Gas Utility Industry Law. Osaka Gas defines low pressure as less than 0.01 MPa.
A large area of rising air through a relatively deep layer of the atmosphere. As the air rises, it cools and condenses water vapor into clouds and precipitation.
An atmospheric condition characterized by air rising, expanding and cooling. Low pressure encourages cloud formation and precipitation, and is associated with stormy weather.
Inadequate volume or pressure of water as indicated by a pressure drop when a pump attempts to supply hose streams have too great a length or size.