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A typical raindrop is about 2 mm in diameter, a typical cloud droplet is on the order of 0.02 mm, and a typical cloud condensation nucleus is on the order of 0.0001 mm or 0.1 μm or greater in diameter. [1] The number of cloud condensation nuclei in the air can be measured at ranges between around 100 to 1000 per cm 3. [1]
Cloud condensation nuclei are necessary for cloud droplets formation because of the Kelvin effect, which describes the change in saturation vapor pressure due to a curved surface. At small radii, the amount of supersaturation needed for condensation to occur is so large, that it does not happen naturally.
The Twomey effect describes how additional cloud condensation nuclei (CCN), possibly from anthropogenic pollution, may increase the amount of solar radiation reflected by clouds. This is an indirect effect (or radiative forcing ) by such particles, as distinguished from direct effects (forcing) due to enhanced scattering or absorbing radiation ...
As the air is cooled to its dew point and becomes saturated, water vapor normally condenses to form cloud drops. This condensation normally occurs on cloud condensation nuclei such as salt or dust particles that are small enough to be held aloft by normal circulation of the air. [14] [15]
On a microscopic scale, clouds are formed through the condensation of water on cloud condensation nuclei. These nuclei are aerosols such as dust or sea salt but also include certain forms of pollution. [1] Nuclei come from a variety of natural or anthropogenic sources.
“Certain nuclei are sprinkled into the clouds to facilitate cloud condensation, leading to rainfall,” Mrutyunjay Mohapatra, the director general of the India Meteorological Department (IMD ...
The resulting ions act as condensation nuclei, around which a mist will form (because the mixture is on the point of condensation). Cloud seeding, a form of weather modification, is the attempt to change the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice ...
Four years ago, astronomers noticed the abundant clouds on Neptune had largely disappeared. Telescope data may have helped researchers figure out why.