Pressure Activity scaffolding activity
Introduction:
Though you may not realize it, the air has weight. All the air molecules in the atmosphere exert a force, or pressure, on our bodies.
Pressure A type of stress characterized by uniformity in all directions.
Pressure systems on weather maps
On weather maps, which often display weather fronts and pressure systems graphically, low-pressure systems are depicted with a capital L, ...
Low pressure systems or mid-latitude cyclones are atmospheric circulations that rotate clockwise in the Southern Hemisphere (anti-clockwise in the Northern Hemisphere).
Barotropic System - A weather system in which temperature and pressure surfaces are coincident, i.e., temperature is uniform (no temperature gradient) on a constant pressure surface.
pressure force"(Or pressure-gradient force.) The force due to differences of pressure within a fluid mass.
pressure-type anemometer
Any instrument that measures the wind speed by measuring the pressure exerted by the wind upon the sensor element of that instrument. Examples include the pressure plate anemometer and the Pitot tube.
psychrometer ...
pressure altitude—The altitude in the standard atmosphere at which the pressure is the same as at the point in question.
Pressure Gradient-The amount of pressure change occurring over a given distance.
Radiosonde-A lightweight package of weather instruments fitted with a radio transmitter and carried up into the atmosphere by a balloon.
Pressure - a force per unit area or a stress characterized by uniformity in all directions
Pressure Gradient - the change in pressure over a given distance at a given time ...
Pressure
The force per unit area. In meteorology, pressure refers to the weight of air in a column directly above a point.
The standard atmospheric pressure at mean sea level is 1013.
PRESSURE TENDENCY: (BAROMETRIC TENDENCY) The change in barometric pressure within a specified period of time (typically 3 hours for meteorological observations).
PRESSURE: The force exerted by the interaction of the atmosphere and gravity. Also known as atmospheric pressure.
PVA: Positive Vorticity Advection.
QPF: Quantitative Precipitation Forecast ...
Pressure The force exerted by the weight of the atmosphere, also known as atmospheric pressure. When measured on a barometer, it is referred to as barometric pressure and it is expressed in inches of mercury, millibars, or kiloPascals.
Pressure- a measure of the weight of the air, that is usually measured with a barometer in meteorology.
- Q -
Quality Of Snow- the amount of ice in a snow sample expressed as a percent of the weight of the sample.
Pressure Gradient Force- Force acting on air that causes it to move from areas of higher pressure to areas of lower pressure.
Pressure Pressure is the force exerted on an object by something else. For example, when pressing a tack into the wall, you are exerting pressure on the wall through the tack.
air pressure: barometric pressure; weight of the atmosphere at a particular point of interest.
anomaly 1: unusual temperature or precipitation for a given region over a specified period. Also see anomaly 2 (Orbital Mechanics section).
Air Pressure - Force that air exerts over a certain area due to it's weight or motion.
Amu - atomic mass unit, the unit used to measure the masses of subatomic particles; a proton has a mass of 1 amu.
Air pressure The cumulative force exerted on any surface by the molecules composing air; usually expressed as the weight of a column of air per unit surface area.
Air pressure gradient Change in air pressure with distance.
Air pressure
The weight of the air in the atmosphere pressing down on the Earth
Anemometer ...
Air pressure (atmospheric pressure) The pressure exerted by the weight of air above a given point, usually expressed in millibars (mb) or inches of mercury (Hg).
Air Pressure - The force exerted by the weight of a column of air above a given point.
LOW PRESSURE SYSTEM An area of a relative pressure minimum that has converging winds and rotates in the same direction as the earth. This is counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
AIR PRESSURE
The weight of air above a given point, measured with a barometer.
low pressure system: area of minimum air pressure, and cyclonic air movement.
Low Pressure Area - or a "Low" An area of low atmospheric pressure that has a closed counter-clockwise circulation in the Northern Hemisphere. Also known as a cyclone.
-M- ...
PG- Pressure gradient. Tightening pressure gradient indicates stronger winds.
HIGH PRESSURE SYSTEM An area of relative pressure maximum that has diverging winds and a rotation opposite to the earth's rotation. This is clockwise the in Northern Hemisphere and counterclockwise in the Southern Hemisphere.
Vapor Pressure - permalink - collapse
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The partial pressure of water vapor in an air-water system.
NOAA National Weather Service - Cite This Source - This Definition ...
Vapor Pressure The pressure exerted by water vapor molecules in a given volume of air.
Variable Ceiling A ceiling of less than 3,000 feet which rapidly increases or decreases in height by established criteria during the period of observation.
Vapor Pressure
The partial pressure of water vapor in an air-water system.
Variable Wind ...
Station Pressure
The absolute air pressure at a given reporting station. The air pressure is directly proportional to the combined weight of all air in the atmosphere located in a column directly above the reporting site.
Pressure- The force pushing on an area or surface.
Psychrometer- An instrument used to measure relative humidity, consisting of a wet-bulb thermometer and a dry-bulb thermometer.
Pressure is usually measured in millibars, 1 mb = 103 dyne/cm2. Distance is conveniently measured in the length of a degree of latitude, which is 111 km or 69 mi. Then, a pressure gradient of 1 mb per degree of latitude is 8.993 x 10-5 dyne/cm2/cm.
PRESSURE: The force exerted by the weight of air above a given point, usually expressed in millibars (mb) or inches of mercury (in. Hg).
Pressure gradient wind
The wind that results from the pressure gradient. The greater the pressure gradient between two points, the greater the wind.
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.
PRESSURE ALTITUDE - The apparent altitude which varies as air pressure (and this density) varies.
PROPELLER - A device with angled blades that is spun by the engine so as to push air backwards and thereby create forward motion or thrust.
Pressure: the exertion of force upon a surface by a fluid (e.g., the atmosphere) in contact with it.
Primary pollutant: substances that are pollutants immediately on entering the atmosphere. Compare secondary pollutant.
Q ...
Pressure Unsteady - A pressure that fluctuates by 0.03 inch of mercury or more from the mean pressure during the period of measurement.
Prevailing Wind - The direction from which the wind blows most frequently in any location.
A pressure unit of 1000 dynes cm-2, often used for reporting atmospheric pressure where one millibar equals 1 hectopascal (hPA).
Mirage(6) ...
Air Pressure - or atmospheric pressure. air pressure is the force exerted on a surface by the weight of the air above it.
The pressure of the atmosphere as indicated by a barometer.
Barotropic System ...
Low Pressure System - A whirling mass of warm, moist air that generally brings stormy weather with strong winds. When viewed from above, winds spiral into a low-pressure center in a counterclockwise rotation in the Northern Hemisphere.
LOW PRESSURE - A region of low air pressure in the atmosphere. Commonly associated with storms and cyclones.
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, and humidity.
Constant Pressure Maps: A weather map of a particular constant pressure surface, such as the 50 kPa or 500 mb surface, in which atmospheric pressure is uniform everywhere.
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.
Sea Level Pressure: The pressure value obtained by the theoretical reduction or increase of barometric pressure to sea-level.
Barometric Pressure: The actual pressure value indicated by a pressure sensor.
Normally high pressure is located in the eastern Pacific off the shores of Ecuador and Peru, likewise, low pressure is situated over the western Pacific in the area of Indonesia and Australia.
Atmospheric Pressure
(pressure) Pressure (force per unit area) exerted by the atmosphere on any surface by virtue of its weight; ...
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.
Actual pressure The atmospheric pressure at the level of the barometer. May or may not be the same as station pressure. Adfreezing The process by which one object becomes adhered to another by the binding action of ice.
Eye: The low pressure center of a tropical cyclone. Winds are normally calm and sometimes the sky clears. ...
Millibar - A pressure unit of 1000 dynes cm-2, often used for reporting atmospheric pressure where one millibar equals 1 hectopascal (hPA).
Arctic highA very cold high pressure that originates over the Arctic Ocean.
The scale categorizes potential damage based on barometric pressure wind speeds, and storm surge. See the scale. ST. ELMO'S FIRE A luminous, and often audible, electric discharge that is intermediate in nature.
RadiosondeAn instrument that is carried aloft by a balloon to send back information on atmospheric temperature, pressure and humidity by means of a small, expendable radio transmitter.
 See also: Air, Temperature, Surface, Weather, High
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