IAS Score

All India PT Mock Test (OMR Based) Across 20 Cities

will be conducted on 6th May and 20th May, 2018. Click here for Test Schedule & Online admission.

Test Center List:

  1. Delhi
  2. Jammu
  3. Chandigarh
  4. Ahmedabad
  5. Bhopal
  6. Lucknow
  7. Allahabad
  8. Patna
  9. Ranchi
  10. Kolkata
  11. Bhubaneswar
  12. Raipur
  13. Jaipur
  14. Mumbai
  15. Pune
  16. Nagpur
  17. Hyderabad
  18. Chennai
  19. Coimbatore
  20. Bengaluru

Cloud Seeding

Cloud Seeding

Introduction: Natural rainfall occurs when supercooled cold water contacts particles of dust, salt or sand forming ice crystals. The ice crystals provide anucleus(tiny solid or liquid particles, suspended in the atmosphere) around which more water droplets can attach, increasing the size of the droplet, or in colder air snow flakes. When the droplet or snow flake, becomes large enough, it falls as snow or rain. It is the technique of inducing rain from a cloud, usually by dropping suitable particles into clouds containing supercooled water in an attempt to cause them to dissipate, modify their structure, or alter the intensity of associated phenomena, such as wind speed or hail. Weather modification, commonly known ascloud seeding, is the application of scientific technology that can enhance a clouds ability to produce precipitation. Cloud seeding is the process of spreading either dry ice, or more commonly, silver iodide aerosols, into the upper part of clouds to try to stimulate the precipitation process and form rain. Weather Modification, is on the forefront of scientific technology to maximize water availability worldwide. Application of scientific concepts and extensive scientific experimentation has proven that cloud seeding increases the amount of precipitation. There are three cloud seeding methods: static, dynamic and hygroscopic. Hygroscopic cloud seedingdisperses salts through flares or explosives in the lower portions of clouds. The salts grow in size as water joins with them. Static cloud seedinginvolves spreading a chemical like silver iodide into clouds. The silver iodide provides a crystal around which moisture can condense. The moisture is already present in the clouds, but silver iodide essentially makes rain clouds more effective at dispensing their water. Dynamic cloud seedingaims to boost vertical air currents, which encourages more water to pass through the clouds, translating into more rain. Up to 100 times more ice crystals are used in dynamic cloud seeding than in the static method. The process is considered more complex than static clouding seeding because it depends on a sequence of events working properly.

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