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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).


Popular term applied to all activities designed to increase, through any artificial means, the amount of precipitation released from a cloud.
References in periodicals archive ?
31 October 2012 - US venture and growth equity investor Norwest Venture Partners (NVP) has taken a minority stake in The Rainmaker Group Ventures LLC, providing it with USD33.
This is an exciting time for RainMaker clients and employees," said James Hammond, vice president of RainMaker Solutions (formerly president of RainMaker Software).
A key aspect of this enhanced solution is to provide our clients a way to partner with Rainmaker on a scalable, repeatable and predictable sales model.
Contact A RainMaker Venture today and let your Dreams become Reality.
Rainmaker is a privately held Software and Consulting firm that has been serving the Manufactured Housing Industry for 34 years.
The RainMaker Humidifier consists of a non-porous, hydrophilic Teflon([R]) membrane that excludes particles, micro-droplets, volatile gases, and other opposite charged species from being transferred to the carrier gas and ensures only water vapor is added.
PITTSBURGH -- eBillingHub([R]), the market leader in simplifying electronic billing for law firms, today announced it has entered into a reseller agreement with RainMaker Software, Inc.
Michael Silton, CEO, Rainmaker, said, "Market2Lead has developed unique and powerful technology that will be quite valuable to users of our LeadWorks solution.
VANCOUVER, British Columbia -- "ReBoot," the classic animated episodic television series, is being redeveloped as a trilogy of feature length films by Rainmaker Animation with the help of new media applications, it was announced today by Warren Franklin, CEO of Rainmaker Entertainment.
Products on display are the RASIRC Steamer UHP, RainMaker[TM] Humidifier, and RainMaker Humidification System.
In addition, the Rainmaker can tightly regulate relative humidity (rH) by controlling water supply temperature.