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production of rainrain,
precipitation in liquid form. It consists of drops of water falling from clouds; if the drops are very small, they are collectively termed drizzle. Rain plays a key role in the hydrologic, or water, cycle in which moisture from the oceans evaporates, condenses into clouds,
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 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.


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).

The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/


Popular term applied to all activities designed to increase, through any artificial means, the amount of precipitation released from a cloud.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Rainmaker is the hotel revenue and profit optimisation cloud that partners with hotels, resorts and casinos to help them outperform their revenue and profit objectives.
RMDS is looking forward to maintaining and enhancing its comprehensive suite of digital marketing solutions ranging from digital marketing strategy to persuasive content creation plus development, design, and technology implementation via the Rainmaker Platform.
After thorough evaluation, we are confident that Rainmaker technology will provide the much-needed, consistent supplies of safe drinking water to these communities.
RainMaker is part of the vital economic engine here, and this commitment to build such a great hotel is an essential building block for our economy.
Back in the day of the rainmaker, it was sufficient that the owner-advisor (or other person responsible for bringing in new clients) knew about the firm and what the firm does for its clients.
Though 54 percent of the students in the study identified themselves as conservatives or supporters of the Republican Party, the research showed that not only did viewers of both "As Good as It Gets" and "The Rainmaker" become more liberal on healthcare, this change persisted for two weeks after viewing the films.
Sohl was named Vice President of Technology Operations for Rainmaker Group.
The Rainmaker BBC1, 11.55pm, (Scotland 12.25am) Francis Ford Coppola's courtroom drama stars Matt Damon as an idealistic lawyer learning the dirtier tricks of the trade to get justice for his client.
Provider of B2B e-commerce solutions Rainmaker Systems Inc (NASDAQ: RMKR) announced on Thursday that it has enhanced its suite of cloud solutions, which help companies to drive online sales and renewals for products, subscriptions.
JUST THE TWO OF US There's a blackbird in the garden That we share I am the rainmaker Of an odd-assorted pair.
24 June 2011 - Merriman Capital is acting as the sole placement agent for the registered direct offering of Rainmaker Systems' (NASDAQ:RMKR) units for net proceeds of USD3.4m (EUR2.4m), the US business-to-business e-commerce solutions provider said on Thursday, when it priced the deal.