The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. Atmospheric pressure can be measured with a mercury barometer (hence the commonly used synonym barometric pressure), which indicates the height of a column of mercury that exactly balances the weight of the column of atmosphere over the barometer. The layer of air that scientists can measure with reasonable accuracy extends around 25 miles up, according to LiveScience. base level for measuring elevations. She or he will best know the preferred format. Teach your students about the Earth's atmosphere with the resources in this collection. Local, National and International weather maps, graphs and charts forecasts. An altimeter is a device that measures altitude, the distance of a point above sea level. an instrument that measures atmospheric pressure. United States Barometric Pressure Map - WeatherWX.com Maps with barometric pressure readings in millibars (mb) or inches (in). However, over cold air the decrease in pressure can be much steeper because its density is greater than warmer air. It differs from climate, which is all weather conditions for a particular location averaged over about 30 years. Erin Sprout It is approximately equal to Earth's atmospheric pressure at sea level. A solar system is a group of planets, meteors, or other objects that orbit a large star. If you have questions about how to cite anything on our website in your project or classroom presentation, please contact your teacher. A barometer measures atmospheric pressure, which is also called barometric pressure. weather pattern characterized by low air pressure, usually as a result of warming. It impacts the way people dress each day and the types of structures built. It is the force exerted on a surface by the air above it as gravity pulls it to Earth. Hilary Hall Honolulu is a city at sea level. When you reach out to him or her, you will need the page title, URL, and the date you accessed the resource. The New Dictionary of Cultural Literacy, Third Edition Announcing our NEW encyclopedia for Kids! Hilary Costa Tim Gunther, Jeannie Evers, Emdash Editing At heights above 1,500 to 3,000 metres (5,000 to 10,000 feet), the pressure is low enough to produce mountain sickness and severe physiological problems unless careful acclimatization is undertaken. Near Earth’s surface the pressure decreases with height at a rate of about 3.5 millibars for every 30 metres (100 feet). force per unit area exerted by the mass of the atmosphere as gravity pulls it to Earth. In a barometer, a column of mercury in a glass tube rises or falls as the weight of the atmosphere changes. High-pressure systems usually lead to fair, calm weather. mild or merciful in disposition or character; lenient; compassionate. This article was most recently revised and updated by, https://www.britannica.com/science/atmospheric-pressure, Public Broadcasting Service - Atmospheric Pressure, Hyperphysics - Atmospheric Pressure Examples, LiveScience - Atmospheric Pressure: Definition and Facts, atmospheric pressure - Student Encyclopedia (Ages 11 and up). Powered by. Meteorologists use barometers to measure this. Barometric Pressure map for United States. Atmospheric pressure, force per unit area exerted by an atmospheric column (the entire body of air above the specified area). There are 0.00131579 atmospheres in a torr. Sea level is determined by measurements taken over a 19-year cycle. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101325 Pa (1.01325 bar). The symbol for atmosphere is atm. All rights reserved. An atmosphere (or standard atmosphere) is a non-SI unit of Pressure. Earth Science, Meteorology, Geography, Physical Geography, Physics, This lists the logos of programs or partners of NG Education which have provided or contributed the content on this page. scale for measuring surface temperature, used by most of the world, in which the boiling point of water is 100 degrees. Earth’s atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases. Global mean air pressure at sea level in July, where high-pressure centres are more pronounced, especially over the North Atlantic and North Pacific oceans. Articles from Britannica Encyclopedias for elementary and high school students. Use these resources to teach students about the objects and relationships within our solar system. Much of the carbon dioxide present in Earth’s first atmosphere has been removed by photosynthesis, chemosynthesis, and weathering. Also known as DCS, divers disease, and the bends. And yet, that part of our atmosphere that sustains all life that we know of is, in reality, exceedingly thin and extends upward only to about 18,000 feet just over 3 miles. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. And the part of our atm… It is sometimes used as a reference or standard pressure. Central Asia, however, is dominated by a strong high-pressure cell. If a media asset is downloadable, a download button appears in the corner of the media viewer. National Geographic Headquarters Published by Houghton Mifflin Harcourt Publishing Company. Also called standard atmospheric pressure. Join our community of educators and receive the latest information on National Geographic's resources for you and your students. Weather is influenced by latitude, altitude, and local and regional geography. Air molecules push down on the surface of the mercury. chemical element with the symbol O, whose gas form is 21% of the Earth's atmosphere. Absentee Ballot vs. Mail-In Ballot: Is There A Difference? All rights reserved. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Mountain climbers use bottled oxygen when they ascend very high peaks. Global mean air pressure at sea level in January, where high-pressure centres are more diffuse. The American Heritage® Science Dictionary All rights reserved. Terms of Service |
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