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cloud seeding

noun
1.
any technique of adding material to a cloud to alter its natural development, usually to increase or obtain precipitation.
Origin
1945-1950
1945-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for cloud seeding
  • In particular, it aims to uncover the mechanism behind cloud seeding which has long baffled meteorologists.
  • cloud seeding has advantages over many other strategies for providing water.
  • Silver is also used for cloud seeding, as an antibacterial agent, and has been used for water purification.
  • cloud seeding injects special substances into the clouds that enable snowflakes and raindrops to form more easily.
  • The idea of this particular cloud seeding was to promote the storm to only produce small hail.
  • Moreover, observations showed that hurricanes contain little of the supercooled water necessary for cloud seeding to work.
  • cloud seeding operations are common in winter at the airport and may commence when the temperature drops to a critical level.
  • The estimated cost of water developed in these areas by cloud seeding is about one dollar per acre-foot.
cloud seeding in Science
cloud seeding  
A method of making a cloud give up its moisture as rain, especially by releasing particles of dry ice or silver iodide into cold clouds. Dry ice freezes water droplets in the cloud, turning them into nuclei for the formation of raindrops. Silver iodide particles are used because they have a crystal structure similar to ice and can also serve as nuclei for raindrop formation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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cloud seeding in Culture

cloud seeding definition


A technique for producing rain by dropping chemicals or small objects into clouds.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Article for cloud seeding

deliberate introduction into clouds of various substances that act as condensation nuclei or ice nuclei in an attempt to induce precipitation. The first experiments with cloud seeding were conducted in 1946; since then seeding has been performed from aircraft, rockets, cannons, and ground generators. Many substances have been used, but solid carbon dioxide and silver iodide have been the most effective; when used in supercooled clouds (composed of water droplets at temperatures below freezing), they form nuclei around which the water droplets evaporate. The resulting water vapour deposits into ice crystals, which build quickly as water droplets attach themselves. Attempts have been made to use these substances to minimize damage to crops and buildings from hailstones.

Learn more about cloud seeding with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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8
11
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