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atmosphere

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air

air  

1 A mixture of gases that makes up the Earth's atmosphere. It comprises about 78% nitrogen, 21% oxygen, less than 1% of carbon dioxide and other gases, and varying amounts of water vapour that humans ...
air mass

air mass  

Large body of air (sometimes of oceanic or continental proportions) identified primarily by an approximately constant wet-bulb-potential temperature (i.e. the lowest temperature to which the air can ...
airborne particle

airborne particle  

A particle that exists in the atmosphere as a solid or liquid. It can come from natural and/or human sources, and can vary in size from coarse (bigger than 3 micrometres in diameter) to fine (less ...
airborne particulate

airborne particulate  

The suspended matter that exists in the atmosphere as tiny solid particles or liquid droplets. It comes from many sources, including windblown dust, emissions from industrial processes, smoke from ...
anticyclone

anticyclone  

Area or system of high atmospheric pressure that has a characteristic pattern of air circulation, with subsiding air and horizontal divergence of the air near the surface in its central region. Winds ...
argon

argon  

A natural, colourless, odourless, inertgas that is the third most abundant constituent of dry air (it comprises 0.93% of the Earth's atmosphere).
atmosphere

atmosphere  

1 (atm.) A unit of pressure equal to 101 325 pascals. This is equal to 760.0 mmHg. The actual atmospheric pressure fluctuates around this value. The unit is usually used for expressing pressures well ...
atmospheric pressure

atmospheric pressure  

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The pressure exerted by the atmosphere as a result of gravitational attraction exerted on the column of air lying above a particular point. Atmospheric pressure, measured in millibars, decreases ...
atmospheric structure

atmospheric structure  

The broadly horizontal layering of the atmosphere, the layers being distinguished by differences in the rate of change of temperature with height, which either favour or discourage the development of ...
atmospheric transport

atmospheric transport  

The movement of air pollutants from one region to another via the atmosphere, which may be for hundreds or even thousands of kilometres and can cross national boundaries to create international or ...
baroclinic

baroclinic  

1 Applied to an atmospheric condition in which isobaric and constant-density surfaces are not parallel, e.g. in a frontal zone.2 Applied to a state in the ocean in which the surfaces of constant ...
barometric pressure

barometric pressure  

The pressure exerted by the atmosphere at a given place and time. It is often expressed in terms of the supported height of a column of mercury, usually measured in ...
barotropic

barotropic  

Describing atmospheric conditions where trends in pressure align with trends in temperature, as in the ideal air mass; the reverse of baroclinic.
biogeochemical cycle

biogeochemical cycle  

The cyclical movement of elements between living organisms (the biotic phase) and their nonliving (abiotic) surroundings (e.g. rocks, water, air). Examples of biogeochemical cycles are the carbon ...
biosphere

biosphere  

The whole of the region of the earth's surface, the sea, and the air that is inhabited by living organisms.
black body temperature

black body temperature  

The temperature that the surface of a body (such as a planet, like the Earth) would be if it were not warmed by its own atmosphere. It can be calculated using the Stefan–Boltzmann equation. The black ...
boundary layer

boundary layer  

Any layer of the atmosphere significantly affected by the earth's surface. The laminar boundary layer is the few millimetres above the surface; the turbulent boundary layer denotes the conspicuously ...
buoyancy

buoyancy  

The upward thrust on a body immersed in a fluid. This force is equal to the weight of the fluid displaced (see Archimedes' principle).
carbon cycle

carbon cycle  

The movement of carbon through the surface, interior, and atmosphere of the Earth. Carbon exists in atmospheric gases, in dissolved ions in the hydrosphere, and in solids as a major component of ...
carbon dioxide

carbon dioxide  

A colourless, odourless gas which is the fourth most abundant component of the air in the homosphere, amounting to about 0.035 per cent by volume. It is released by volcanoes, part of the source ...

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