air pressure science definition
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air pressure The definition of air pressure is the force exerted onto a surface by the weight of the air. An example of air pressure is the average sea-level air pressure of 101.325 kPA. the pressure of atmospheric or compressed air. Noun.
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- Air Pressure and Humidity. 1  Air pressure is the weight of the atmosphere pressing down on the earth. 2  It is measured by a barometer in units called millibars. 3  Most barometers use mercury in a glass column, like a thermometer, to measure the change in air pressure.
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KEY POINTS 1. Define air pressure and how it changes with height in the atmosphere. Air pressure can be thought of as the weight of the air above a given level. Pressure decreases with height in the atmosphere. 2. What are high and low pressure areas and what are the characteristics of the surface weather map, including pressure adjustments and isobars. High pressure areas (anticyclones) are zones of descending air and diverging winds with generally clear weather.
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How Is Air Pressure Measured? Quick Answer. Air pressure is measured by using a barometer, the value of which is given in varying units, including inches of mercury (in Hg) or millimeters of mercury (mm Hg), torr (Tor), bar or millibars (mb), pounds per square inch (psi) and pascal (Pa).
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Air Pressure Surfnetkids recommends five air pressure websites for families and classrooms. Air pressure is the weight (or force) of the atmosphere at any particular point. Although you can't feel it or see it, air pressure plays an important part in weather, and can be demonstrated with some really fun experiments.
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What Does a Barometer Measure? Atmospheric pressure — often referred to simply as air pressure — is the constant force exerted on you by the weight of little particles of air. These tiny air particles, called air molecules, can't be seen, but they are all around you. They have weight, which means they constantly “push down on you.
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negative pressure arterial pressure (arterial blood pressure) blood pressure (def. 2). atmospheric pressure the pressure exerted by the atmosphere, usually considered as the downward pressure of air onto a unit of area of the earth's surface; the unit of pressure at sea level is one atmosphere.
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Pressure Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled gage pressure) is the pressure relative to the local atmospheric or ambient pressure.Various units are used to express pressure.he SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m 2 or kg·m −1 ·s −2). This name for the unit was added in 1971; before that, pressure in SI was expressed simply in newtons per square metre. Other units of pressure, such as pounds per square inch and bar, are also in common use.
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- Barometric pressure is the weight of an overlying air mass in a particular area. It’s synonymous with atmospheric pressure. Meteorologists monitor barometric readings to predict weather changes; shifts in the barometer can indicate the approach of a high-pressure (usually fair-weather) or low-pressure (more unsettled) system.
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Learn About High and Low Air Pressure Systems By definition, atmospheric or air pressure is the force per unit of area exerted on the Earth’s surface by the weight of the air above the surface. The force exerted by an air mass is created by the molecules that make it up and their size, motion, and number present in the air. 1  These are important factors because they determine the temperature and density of the air and thus its pressure. The number of air molecules above a surface determines air pressure. As the number of molecules increases, they exert more pressure on a surface and the total atmospheric pressure increases. By contrast, if the number of molecules decreases, so too does the air pressure. Today, air pressure is often measured with a mercury or aneroid barometer. A mercury barometer measures the height of a mercury column in a vertical glass tube.
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What is Air Pressure? Air pressure basically refers to the volume of air in a particular environment, with greater volumes creating higher pressures. On the earth's surface, for example, it is known as atmospheric pressure and refers to the weight of the earth's atmosphere pressing down on everything.
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Brain Research Methods A neuroimaging technique involving the injection of radioactive glucose into the bloodstream, tracking the blood flow to the brain and combining this date into a series of computer-generised colour-coded images of the level of activity in various brain areas while engages in different tasks.ingle Photon Emission Computed Tomography (SPECT). A nuclear imaging technique involving the injection of a radioactive tracer substance into the blood stream and resulting in 3-D images of internal brain structure and functioning.
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Air Pressure, Temperature, and Density at Altitude Density is the amount of mass per a unit of volume in a substance. Air pressure is when the atmosphere of the earth is pressing down on everything on it. The atmosphere is made out of gases, and those press down incredibly hard on to us, even though most of us don't know it.
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barometric pressure Definition of barometric pressure. : the pressure of the atmosphere usually expressed in terms of the height of a column of mercury.
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Atmospheric Pressure That is, of course, because the higher density means that the air column has greater mass and exerts a greater force on the area below it. Pressure is generally measured in units of Pascals. Atmospheric scientists, however, like to express pressure in units of bars.
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In Time Will attempts to get some time back from Borel, but learns from his wife Greta (Yaya DaCosta) that he used his time to drink himself to death with nine years left on his clock. Sylvia is forced to pawn some jewelry to get time for herself and Will, and Will calls Weis to demand a 1,000 year ransom for her.
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Atmospheric pressure Standard atmospheric pressure or the standard atmosphere (1 atm) is defined as 101.325 kilopascals (kPa). This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries.
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- Pressure. In physics, pressure, P, is the measure of the force exerted over a certain area. We generally say something exerts a lot of pressure on an object if it exerts a great amount of force on that object, and if that force is exerted over a small area.
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- Air -The mixture of gases, which form the atmosphere of the Earth. Air Pollution – Chemicals or substances in the atmosphere that are directly or indirectly harmful to living things. 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. Alberta Clipper - A fast-moving low pressure system that occurs during the winter and sweeps southeast from Alberta, Canada, across the northern Great Plains and Midwest of the United States.
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- Pressure & Density. The Weather Channel. • Air pressure is considered to be the weight of the air above some region. • More air above a region will result in higher pressure while less air above a region will. result in lower pressure. • Standard atmospheric sea-level pressure is 1013.2 mb, 29.92 in (of mercury), or 14.7.
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The weather variables we measure and store The weather variables we measure and store. Atmospheric Pressure Atmospheric pressure is the force per unit area exerted by the weight of the air. In general it is the pressure differences in space and time that we are interested in.
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Water Pressure at Depth Pressure, or the amount of force per unit of area, is the key. The Earth is covered with a layer of air 80 miles thick. Like any type of matter, the gases in air have mass, and since Earth’s gravity pulls this mass down onto the Earth’s surface, the air produces a force called atmospheric pressure.
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- Atmospheric pressure is the pressure exerted by the weight of air in the atmosphere of Earth (or that of another planet). In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point.he boiling point is the temperature at which the vapor pressure is equal to the atmospheric pressure around the water. Because of this, the boiling point of water is lower at lower pressure and higher at higher pressure.
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Atmospheric Pressure: Definition & Effects An atmosphere is the unit for atmospheric pressure, and sea level is set at 1 atmosphere (atm). The atmospheric pressure at any given point depends on two factors: altitude (the height of a thing in relation to sea level) and temperature (the intensity of heat).
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Density of air Density of air. The density of air (air density) is the mass per unit volume of Earth's atmosphere. Air density, like air pressure, decreases with increasing altitude. It also changes with variation in temperature or humidity.
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pressure- definition and synonyms Explore Thesaurus. a. [countable/uncountable] physics the amount of force that a gas or liquid produces in an area or container. atmospheric / air / water pressure. high/low pressure (=of the air in the atmosphere) : an area of high pressure over the Atlantic. Synonyms and related words.