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rainmaking

 
Dictionary: rain·mak·ing   (rān''kĭng) pronunciation

n.
  1. The process of producing or attempting to produce rain, as by magic.
  2. Informal. Cloud seeding.
  3. Informal. The process of achieving excellent results in a profession or field, such as politics.

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Columbia Encyclopedia: rainmaking
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rainmaking, production of rain by artificial means now generally disregarded, though it is probable that rainmaking hastens or increases rainfall from clouds suitable for natural rainfall. Interest in rainmaking has been spurred by factors including drought and the need for irrigation water. Until recent times it was thought that rain might be induced by explosions, updrafts from fires, or by giving the atmosphere a negative charge. Research during the 1930s showed that rain forms in warm clouds when larger drops of condensed water grow at the expense of smaller ones until they are big enough to fall; also that in cold clouds supercooled water below 5°F (−15°C) freezes into ice crystals that act as nuclei for snow. On this basis the American physical chemist Irving Langmuir and his associates carried on Project Cirrus from 1940 to 1952 to find ways to produce rain. Three methods resulted, including spraying water into warm clouds; dropping dry ice into cold clouds, where the dry ice freezes some water into ice crystals that act as natural nuclei for snow; and wafting silver iodide crystals or other similar crystals into a cold cloud from the ground or from an airplane over the cloud, with the crystals hastening the freezing of supercooled water between 27°F (−2.8°C) and 5°F. Overseeding can dissipate a cloud. These techniques are only moderately successful; they cannot be relied upon in case of drought.

Bibliography

See Utah Water Research Laboratory, Development of Cold Cloud Seeding Technology for Use in Precipitation Management (1971); L. J. Battan, Cloud Physics and Cloud Seeding (1979).


WordNet: rainmaking
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Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: activity intended to produce rain


Wikipedia: Rainmaking
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Rainmaking refers to the act of attempting to artificially induce or increase precipitation, usually to stave off drought.

In the US, rainmaking was attempted by traveling showmen. It was practiced in the old west but may have reached a peak during the dust bowl drought of the American West and Midwest in the 1930s. The practice was depicted in the 1956 film The Rainmaker. Attempts to bring rain directly have waned with development of the science of meteorology, the advent of laws against fraud and increased communication technology, with some exceptions such as cloud seeding and prayer.

Since the 1940s, cloud seeding has been used to change the structure of clouds by dispersing substances into the air, potentially increasing or altering rainfall. In spite of experiments dating back to at least the start of the 20th century, however, there is much controversy surrounding the efficacy of cloud seeding, and evidence that cloud seeding leads to increased precipitation on the ground is highly equivocal. One difficulty is knowing how much precipitation might have fallen had any particular cloud not been seeded. Operation Popeye was a US military rainmaking operation to increase rains over Vietnam during the Vietnam War in order to slow Vietnamese military truck activity in the region. China has been making rain for years, while American policy makers and scientists are beginning to take rainmaking seriously once again - they now call it geoengineering - in the hope of combatting global warming (see Guardian 4 November 2009, 'Can we manipulate the weather?').

In many societies around the world rain dances and other rituals have been used to attempt to increase rainfall. European examples include the Romanian ceremonies known as paparuda and caloian. Some Americans also attempt to bring rain during droughts through prayer, a phenomenon particularly common in US farming regions. These rituals differ greatly in their specifics, but share a common concern with bringing rain through ritual and/or spiritual means.

The term is also used metaphorically to describe the process of bringing new clients into a professional practice such as law, architecture or consulting.

See also

Further reading

  • Sanders, Todd 2008. Beyond Bodies: Rainmaking and Sense Making in Tanzania. Toronto, University of Toronto Press

 
 

 

Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/ Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Rainmaking" Read more