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Coalescence (meteorology)
 
 
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Coalescence is the process by which two or more droplets or particles merge during contact to form a single daughter droplet (or bubble). It can take place in many processes, ranging from meteorology
Meteorology

Meteorology is the interdisciplinary scientific study of the Earth's atmosphere that focuses on weather processes and forecasting . Studies in the field stretch back millennia, though significant progress in meteorology did not occur until the eighteenth century....
 to astrophysics
Astrophysics

Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties of astronomical objects such as galaxy, stars, planets, exoplanets, and the interstellar medium, as well as their interactions....
. For example, it is both involved in the formation of raindrops as well as planetary and star formation
Star formation

Star formation is the process by which dense parts of molecular clouds collapse into a ball of Plasma to form a star. As a branch of astronomy star formation includes the study of the interstellar medium and giant molecular clouds as precursors to the star formation process and the study of young stellar objects and planet formation as its i...
.

In meteorology, its role is crucial in the formation of rain. As droplets are carried by the updrafts and downdrafts in a cloud, they collide and coalesce to form larger droplets.






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Encyclopedia


Coalescence is the process by which two or more droplets or particles merge during contact to form a single daughter droplet (or bubble). It can take place in many processes, ranging from meteorology
Meteorology

Meteorology is the interdisciplinary scientific study of the Earth's atmosphere that focuses on weather processes and forecasting . Studies in the field stretch back millennia, though significant progress in meteorology did not occur until the eighteenth century....
 to astrophysics
Astrophysics

Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties of astronomical objects such as galaxy, stars, planets, exoplanets, and the interstellar medium, as well as their interactions....
. For example, it is both involved in the formation of raindrops as well as planetary and star formation
Star formation

Star formation is the process by which dense parts of molecular clouds collapse into a ball of Plasma to form a star. As a branch of astronomy star formation includes the study of the interstellar medium and giant molecular clouds as precursors to the star formation process and the study of young stellar objects and planet formation as its i...
.

In meteorology, its role is crucial in the formation of rain. As droplets are carried by the updrafts and downdrafts in a cloud, they collide and coalesce to form larger droplets. When the droplets become too large to be sustained on the air currents, they begin to fall as rain. Adding to this process, the cloud may be seeded with ice from higher altitudes either by the cloud tops reaching -40 degrees Celsius or the cloud being seeded by ice from cirrus cloud
Cirrus cloud

Cirrus clouds are characterized by thin, wisplike strands, often accompanied by tufts, leading to their common name of mare's tail. Sometimes these clouds are so extensive that they are virtually indistinguishable from one another, forming a sheet of cirrus called Cirrostratus cloud....
s.

Coalescence is also a term used in welding
Welding

Welding is a fabrication or sculpture process that joins materials, usually metals or thermoplastics, by causing coalescence . This is often done by melting the workpieces and adding a filler material to form a pool of molten material that cools to become a strong joint, with pressure sometimes used in conjunction with heat, or by itself,...
. Two (or possibly more) pieces of metal are bonded together by liquifying the places where they are to be bonded, coalescing these liquids, and allowing the coalesced liquid to solidify. At the end of this process the two pieces of metal have become one continuous solid, and if the weld has been made properly, it will be as strong as the original workpieces.

See also

  • Bergeron process
    Bergeron process

    The Bergeron Findeisen Process , also known as the cold rain or ice crystal process, is the formation of Precipitation in the cold clouds of the mid and upper latitudes by ice crystal growth....
  • Coalescer
    Coalescer

    Coalescer a technological device performing Coalescence . Primary use: to separate emulsions in various processes. Basically Coalescer works as reversed emulsifier....


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