Atmospheric pressure is measured by a barometer and expressed in millibars. Normal atmospheric pressure at sea level is 1,013 millibars.
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Atmospheric pressure - Wikipedia, the free encyclopedia
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Atmospheric pressure is sometimes defined as the force per unit area exerted against a surface by the weight of air above that surface at any given point in the Earth's atmosphere. In most circumstan...
en.wikipedia.org/wiki/Atmospheric_pressure
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Air pressure is the weight of the atmosphere pressing down on the earth. It is measured by a barometer in units called millibars. Most barometers use mercury in a glass column, like a thermometer, to measure the change in air pressure.
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www.factmonster.com/ipka/A0769510.html
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Review measurement terms, units, and devices in this printable about air pressure. As a skill challenge, students will explain how a mercury barometer measures air pressure. Grade Levels: 6 - 12 Help with Printables From Pearson's Concept...
http://www.teachervision.fen.com/air/printable/61453.ht...
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A: These questions are related because they are about how air pressure is measured. ... Our Understanding air pressure page has more on each of these measurements and how they are found. Look under the "Pressure corrections " headline on this page.
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www.usatoday.com/weather/resources/askjack/2003-02-18-a...
www.usatoday.com/weather/resources/askjack/2003-02-18-air-pressure-measure_x.htm
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Understanding air pressure ... The weight of the air pressing down on the Earth, the ocean and on the air below causes air pressure. ... Air pressure is related to its density, which is related to the air's temperature and height above the Earth's surface. (Related: Understanding air density).
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www.usatoday.com/weather/wbarocx.htm
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Since air pressure affects weather, you can see why the use of a barometer is so important to ships. However, not so apparent is the importance of air pressure in the operation of the ship’s engine. For that purpose air pressure is measured with a gauge called a manometer.
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An instrument used by weather forecasters and scientists to measure air pressure at any given moment for a particular place. Air pressure is usually measured in millibars or in inches of mercury.
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kids.earth.nasa.gov/archive/air_pressure/glossary.html
kids.earth.nasa.gov/archive/air_pressure/glossary.html
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Pressure - Wikipedia, the free encyclopedia
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Pressure (symbol: p or P ) is the force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure is the pressure relative to the local atmospheric or ambie...
en.wikipedia.org/wiki/Pressure
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