Atmospheric Pressure force exerted by the weight of the air
Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of the air above that surface.
Atmospheric pressure is the pressure above any area in the Earth's atmosphere caused by the weight of air. Standard atmospheric pressure (atm) is discussed in the next section.
atmospheric pressure"(Also called barometric pressure.) The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question.
atmospheric pressure: force exerted on a surface area, created by the weight of air above it.
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barometer: tool for measuring atmospheric pressure.
Atmospheric Pressure - the pressure exerted on an object as a result of the weight of the column of air above the object ...
Atmospheric Pressure- (also called air pressure or barometric pressure) The pressure asserted by the mass of the column of air directly above any specific point.
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).
Related term: barometric pressure ...
Atmospheric Pressure The amount of force exerted over a surface area, caused by the weight of air molecules above it. As elevation increases, fewer air molecules are present. Therefore, atmospheric pressure always decreases with increasing height.
Atmospheric Pressure
The pressure exerted by the earth's atmosphere at any given point, determined by taking the product of the gravitational acceleration at the point and the mass of the unit area column of air above the point.
Atmospheric Pressure: Also called barometric pressure. It is the pressure exerted by the atmosphere as a consequence of the gravitational attraction occurring over a column of air at a specific point.
Air: Mixture of gases which form the atmosphere.
The atmospheric pressure which is exerted by water vapour (water in its gaseous state). It is one way of measuring the humidity of the air.
The atmospheric pressure at the centre of a high or low pressure system.
Centrifugal Force ...
The atmospheric pressure at mean sea level.
Sea surface temperature (SST)(6)
The temperature of the layer of seawater (approximately 0.5 m deep) nearest the atmosphere.
Standard atmospheric pressure A pressure of 1013.26 millibars (mb), 29.92 inches of mercury (Hg), 760 millimeters (mm) of mercury, 14.7 pounds per square inch (lb/in.2), 101,326 pascals (Pa).
Q
QFE Atmospheric pressure at field elevation. QNH Same as altimeter setting. Quadrant electrometer A very sensitive electrostatic electrometer for measuring small potential differences.
Air Pressure - or atmospheric pressure. air pressure is the force exerted on a surface by the weight of the air above it.
Millibar - an atmospheric pressure of 100 Pascals (Newtons per square metre).
Mixing depth - the maximum height air pollution normally reaches. This varies with geography, season and time of day.
BarometerAn instrument for measuring atmospheric pressure.Barometric pressureThe actual pressure value indicated by a pressure sensor.Bitterly coldIn winter, bitterly cold or very cold, refers to more than seven degrees Celsius below normal.
SEA LEVEL PRESSURE The atmospheric pressure at mean sea level, usually determined from the observed station pressure. SEA MILE A unit of length distinguished from a nautical mile. One sea mile is equivalent to 1,000 fathoms (6,000 feet).
2) MichiganMICMeteorologist In ChargeMicrobarographA instrument designed to continuously record a barometer's reading of very small changes in atmospheric pressure.
Aneroid BarometerAn instrument for measuring atmospheric pressure in which a needle, attached to the top of an evacuated box, is deflected as changes in atmospheric pressure cause the top of the box to bend in or out.
Consequently, the station pressure may vary tremendously from one location to another in mountainous regions due to the strong variation of atmospheric pressure with height.
sea level pressureThe atmospheric pressure at mean sea level.sensible heat fluxThe time rate of flow for the energy transferred from a warm or hot surface to whatever is touching it, typically air.
The sum of the partial pressure of all the atmospheric gases will equal the atmospheric pressure. The partial pressure of CO2 in the atmosphere is determined by the atmospheric CO2 concentration and atmospheric temperature.
Barogram:A written record of the atmospheric pressure: (Graph)
Barograph:A weather instrument used to measure atmospheric pressure. It consists of an aneroid cell which
responds to atmospheric air pressure.
(Sometimes called wedge.) In meteorology, an elongated area of relatively high atmospheric pressure, almost always associated with and most clearly identified as an area of maximum anticyclonic curvature of wind flow.
An elongated area of relatively low atmospheric pressure, usually not associated with a closed circulation, and thus used to distinguish from a closed low.
An instrument used for measuring the change in atmospheric pressure. It uses a long glass tube, open at one end and closed at the other. After first filling the open end with mercury, it is then temporarily sealed and placed into a cistern of mercury.
MERCURIAL BAROMETER An instrument used for measuring the change in atmospheric pressure. It uses a long glass tube, open at one end and closed at the other.
Buys-Ballot's Law Buys-Ballot's Law, sometimes called the baric wind law, is an empirical law in meteorology that relates the horizontal wind field to the atmospheric pressure pattern. It was formulated in 1857 by Christoph H.D.
We must assume, then, that the pressure gradient forces that we know must act because of the lateral variation in atmospheric pressure are exactly balanced by the Coriolis force, so that we have a time-independent flow.
Storm Surge A rise above the normal water level along a shore caused by strong onshore winds and/or reduced atmospheric pressure. The surge height is the difference of the observed water level minus the predicted tide.
Choose a day when the atmospheric pressure is not changing greatly...in association with a slow-moving anticyclone is best (but see also below re: checking over a range).
Arctic Oscillation (AO) - The Arctic Oscillation is a pattern in which atmospheric pressure at polar and middle latitudes fluctuates between negative and positive phases.
North Atlantic Oscillation - the NAO is a large-scale fluctuation in atmospheric pressure between the subtropical high pressure system located near the Azores in the Atlantic Ocean and the sub-polar low pressure system near Iceland and is quantified ...
THICKNESS: The difference in height between two atmospheric pressure levels.
Millibars (mb): Units of atmospheric pressure. The average atmospheric pressure at sea level is 1013.25 mb.
Molecules: Composed of atoms, molecules are the smallest units of a substance that retain the chemical properties of that substance.
Appears as a white solid around -110 (F) that sublimes to a gas at normal atmospheric pressure. The absence of any "liquid" present during this sublimation gives the name "dry ice". Used as a deep-freeze coolant and scientific applications.
BAROMETRIC PRESSURE: The atmospheric pressure at a given point due to the gravitational force on the column of air above it.
BAUD: A unit used in describing the rate of character transmission and equal to approximately one bit per second.
Millibar (mb) Unit of atmospheric pressure. It is equal to 0.03" of mercury. One thousand millibars equals 29.55" of mercury on a barometer.
Miners' Inch A rate of discharge through an orifice one inch square under a specific head.
BAROMETER: An instrument for measuring atmospheric pressure.
BEAUFORT WIND SCALE: A system of estimating and reporting wind speed devised by British Rear-Admiral, Sir Francis Beaufort in 1805, based on observations of the effects of the wind.
Depression- a region of low atmospheric pressure that is usually accompanied by low clouds and precipitation.
Dew- water drops on an object at or near the ground formed from condensation of water vapor from the surrounding air.
barometer: instrument that measures atmospheric pressure.
Bermuda High: a subtropical anticyclone that occurs over the North Atlantic Ocean.
biosphere: the zone between the earth and the atmosphere in which most life forms reside.
MILLIBAR: A unit of atmospheric pressure. 1 mb = 100 Pa (pascal). Normal surface pressure is approximately 1013 millibars.
MONSOON: A persistent seasonal wind, often responsible for seasonal precipitation regime.
HIGH PRESSURE SYSTEM - An area of high atmospheric pressure which generally means good visibility for flying.
HORIZONTAL COMPONENT OF LIFT - Another term for centripetal force. The center-seeking force which causes an airplane to turn.
Barometer: An instrument for measuring atmospheric pressure. There are three common types of barometers used widely today: mercury barometer; aneroid barometer; electronic barometer. See glossary entries for more on these types.
A unit used to measure atmospheric pressure
Monsoon
A seasonal wind that brings rain to many places of the world, for example India and Southern Asia ...
Atmospheric pressure is one of the basic meteorological elements. It is measured by many varieties of barometer and is expressed in several unit systems. The most common unit used is the millibar (1 millibar equals 1000 dynes cm−2).
Sea level pressure The atmospheric pressure at mean sea level.
Semiarid See Steppe.
Sensible heat transfer Movement of heat from one place to another as a consequence of conduction or convection or both.
Aneroid barometer
An instrument designed to measure atmospheric pressure. It contains no liquid.
Annual range of temperature
The difference between the warmest and coldest months at any given location.
1) An elongated area of relatively high atmospheric pressure; the opposite of trough.
or
2) In hydrologic terms, a line or wall of broken ice forced up by pressure. May be fresh or weathered
Ridge Ice ...
Constant-Pressure Surface - A surface along which the atmospheric pressure is everywhere equal at any given moment.
Continental (c) Air Mass - An air mass that forms over land; it is normally relatively dry.
A change in water level caused by atmospheric pressure and wind. A storm surge can cause floodings, especially when it occurs at the same time as a high tide.
Spilling Waves ...
CELSIUS- A temperature scale using 0 as freezing and 100 as boiling at standard sea-level atmospheric pressure and temperature.
CG- Cloud to Ground lightning
CHC- Chance (usually in reference to precipitation probability) ...
The force exerted by the interaction of the atmosphere and gravity. Also known as atmospheric pressure.
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 See also: Pressure, Weather, Surface, Air, Temperature
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