Air pressure is measured in hectopascals. On this weather map the isobars are at 4 hectopascal intervals.
The black arrows show the wind direction. High and low pressure regions do not stay in the same place. They move over the Earth's surface.
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: 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 - or atmospheric pressure. air pressure is the force exerted on a surface by the weight of the air above it. The internationally recognized unit for measuring this pressure is the kilopascal.
Air pressure
The weight of the air in the atmosphere pressing down on the Earth
Anemometer ...
Air Pressure - the pressure exerted by the air
Albedo - the fraction of radiation which reflects off a body ...
Air Pressure - The force exerted by the weight of a column of air above a given point.
Air Pressure- (atmospheric pressure) air pressure is the force exerted on a surface by the weight of the air above it. The internationally recognized unit for measuring this pressure is the kilopascal.
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 weight of air above a given point, measured with a barometer.
Air Pressure The weight of the atmosphere over a particular point, also called barometric pressure. Average air exerts approximately 14.7 pounds (6.8 kg) of force on every square inch (or 101,325 newtons on every square meter) at sea level.
Air pressure
A measure of the mass of air above a given point. Usually expressed in millibars (mb) or hectopascals (hPa). Also known as atmospheric or barometric pressure (pressure measured by a barometer).
Albedo ...
Air Pressure The force exerted on a surface by the weight of the air above it. The internationally recognized unit for measuring this pressure is the kilopascal.
Air Pressure - The weight of air pressing down on earth. Air pressure can change from place to place, and this causes air to move, flowing from areas of high pressure toward areas of low pressure. It's the same as barometric pressure.
Air pressure- A force that is the result of the weight of a column of air pushing down on an area.
Altitude- Elevation above sea level.
Anemometer- An instrument used to measure wind speed.
The air pressure influences the boiling point of water. Celsius claimed that the level of the mercury in boiling water is proportional to the height of the barometer.
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.
A metric unit of air pressure measurement equal to one hectapascal.
Minimum temperature
The lowest temperature in a given period.
Station PressureThe 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.
DATA BUOYS Buoys placed throughout the Gulf of Mexico and along the Atlantic and Pacific coasts of the United States that relay information on air and water temperature, wind speed, air pressure, and wave conditions via radio signals.
Mercury barometer Barometer in which pressure is determined by balancing air pressure against the weight of a column of mercury in an evacuated glass tube.
Winds begin with differences in air pressures. Pressure that's higher at one place than another sets up a force pushing from the high toward the low pressure. The greater the difference in pressures, the stronger the force.
responds to atmospheric air pressure. A pen is attacted to the cell through a series of gears and levers. This pen rides on a chart.
The pen has ink on and it produces a trace on the chart. The chart is attached to a drum which sits on the clock.
air pressureThe cumulative force exerted on any surface by the molecules composing air.albedoAlso known as "brightness," refers to the reflectivity - the percent of radiant energy returning from a surface compared to that which strikes it.
The difference between the exterior air pressure and the interior pressure causes the disk to expand or contract slightly. This movement is amplified by a spring or gear mechanism to indicate changes in air pressure on a scale or recording chart.
Barogram: A graphic record of air pressure produced by a barograph.
Barograph: A recording barometer.
Barometer: An instrument used for measuring air pressure. The two most common types are the mercury barometer and the aneroid barometer.
This is caused by air pressure and wind speed changes associated with vortex allowing the vapor in the air to condense into water droplets. This region does not have to touch the ground to have a tornado.
Millibar. The metric measurement of air pressure. A millibar is 1000 dynes per square centimeter, or 100 pascal (Pa). Surface pressure averages around 1013 millibars.
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How Does a Barometer Measure Air Pressure?
Get detailed directions on measuring air pressure here!
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Just how much is an inch of rain? Find out here! ...
INCHES OF MERCURY (Hg) The name comes from the use of mercurial barometers which equate the height of a column of mercury with air pressure. One inch of mercury is equivalent to 33.86 millibars or 25.40 millimeters.
Kilopascal- A metric unit of air pressure. It is simply millibars divided by 10.
Latent Heat- The energy that is stored when water evaporates. This energy is released when water condenses as a liquid or ice.
Millibar: A metric measurement of air pressure.
North Atlantic Basin (sometimes called just the "Atlantic Basin"): The Atlantic Ocean north of the equator, the Caribbean Sea, and the Gulf of Mexico.
low pressure- a system in which air pressure decreases toward the center, associated with unsettled weather, usually formed by a mass of warm air being forced up by cold air.
In thermodynamics, triple point refers to the temperature and air pressure at which a material (e.g. water) can exist in all three phases (liquid, solid and gas) in equilibrium. The triple point for water is 0.01°C (273.16K) and 607.8 Pa.
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.
ambient pressure"The air pressure that is characteristic of the atmosphere surrounding a small- scale feature such as a cumulus cloud.
The saddle point (sometimes called a "col") refers to a point in the air pressure pattern depicted on a weather map.
A continuous trace of air pressure variation with time, typically produced by a barograph.
barograph ...
high pressure system: area of maximum air pressure and anticyclonic air movement.
humidity: the measure of how much water there is in the air.
SHORTWAVE - a progressive wave in a horizontal air flow that leads to lower air pressure and possibly unsettled weather.
SHOWER - Precipitation that is intermittent, in space, time, or intensity and is falling from a cumuliform cloud.
When you use a straw, you decrease the air pressure in the straw, and the high pressure pushing down on the rest of the drink pushes the drink up the straw.
Doldrums- the regions on either side of the equator where air pressure is low and winds are light.
(remember air pressure is a measure of the weight or pressure exerted by all the molecules in the air)
(e.g., 24 milibars of pressure exerted by water vapor compared to about 1000 milibars exerted by the atmosphere as a whole) ...
Mercury barometer A mercury-filled glass tube in which the height of the mercury column is a measure of air pressure.
VAPOR PRESSURE- The amount of pressure (usually expressed in millibars) exerted from molecules of water vapor independent from the pressure exerted from the air. The vapor pressure is a trace to about 4% of the total air pressure at any one time.
DOCDepartment of CommerceDOHDevelopment and Operations HydrologistDoldrumsThe regions on either side of the equator where air pressure is low and winds are light.
At an air pressure of one atmosphere, ice melts at 0°C by definition of the Celsius temperature scale.
 See also: Air, Pressure, Temperature, Weather, Atmosphere
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