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| A whispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)[syn:cirrus] |
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| A dark grey cloud bearing rain.[syn:nimbus] |
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| A large dark low cloud.[syn:stratus] |
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| A globular cloud.[syn:cumulus] |
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| The transfer of heat by the mass movement of heated particals into an area of cooler fluid. |
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| The gaseous envelope surrounding the Earth; the air. |
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| the lowest layer of the atmosphere, 6 miles (10 km) high in some areas and as much as 12 miles (20 km) high in others, within which there is a steady drop in temperature with increasing altitude and within which nearly all cloud formations occur and weather conditions manifest themselves. |
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| the region of the upper atmosphere extending upward from the tropopause to about 30 miles (50 km) above the earth, characterized by little vertical change in temperature. |
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1.
(in the classification of the earth's atmosphere by chemical properties) the region between the ionosphere and the exosphere, extending from about 250–650 miles (400–1050 km) above the surface of the earth.
2.
(in the classification of the earth's atmosphere by thermal properties) the region between the stratosphere and the thermosphere, extending from about 20–50 miles (32–80 km) above the surface of the earth.
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| the region of the upper atmosphere in which temperature increases continuously with altitude, encompassing essentially all of the atmosphere above the mesosphere. |
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| the force exerted by air, whether compressed or unconfined, on any surface in contact with it. |
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| any instrument that measures atmospheric pressure. |
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| a form of oxygen, O 3 , with a peculiar odor suggesting that of weak chlorine, produced when an electric spark or ultraviolet light is passed through air or oxygen. It is found in the atmosphere in minute quantities, especially after a thunderstorm, is a powerful oxidizing agent, and is thus biologically corrosive. In the upper atmosphere, it absorbs ultraviolet rays, thereby preventing them from reaching the surface of the earth. It is used for bleaching, sterilizing water, etc. |
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| a violent, tropical, cyclonic storm of the western North Atlantic, having wind speeds of or in excess of 72 miles per hour (32 m/sec). Compare tropical cyclone, typhoon. |
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| a localized, violently destructive windstorm occurring over land, especially in the Middle West, and characterized by a long, funnel-shaped cloud extending toward the ground and made visible by condensation and debris. Compare waterspout. |
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| Electronics . a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. |
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| instrument for measuring the speed of wind. |
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