What is cloud?

  • (verb): Place under suspicion or cast doubt upon.
    Synonyms: defile, sully, corrupt, taint
    See also — Additional definitions below


In meteorology, a cloud is a visible mass of liquid droplets or frozen crystals made of water or various chemicals suspended in the atmosphere above the surface of a planetary body. These suspended particles are also known as aerosols. Clouds in earth's atmosphere are studied in the cloud physics branch of meteorology. Two processes, possibly acting together, can lead to air becoming saturated; cooling the air or adding water vapor to the air. In general, precipitation will fall to the surface; an exception is virga, which evaporates before reaching the surface.

Read more about Cloud.

Some articles on cloud:

Jeans Instability - Jeans Length
... Jeans' length is the critical radius of a cloud (typically a cloud of interstellar dust) where thermal energy, which causes the cloud to expand, is ... The formula for Jeans Length is where is Boltzmann's constant, is the temperature of the cloud, is the radius of the cloud, is the mass per particle in the cloud, is ... the cloud's mass divided by the cloud's volume) ...
Cloud - Extraterrestrial
... any planet or moon with an atmosphere also has clouds ... Venus's thick clouds are composed of sulfur dioxide ... Mars has high, thin clouds of water ice ...
Cloud Nine
... Cloud nine or on cloud nine is an idiom referring to a state of elation or happiness ... It may also refer to ...
Preston Cloud - Professional Career
... Cloud's professional career alternated between the United States Geological Survey (where he was chief paleontologist from 1949-1959) and academia (Missouri School of Mines and Metallurgy, 1940-41 Harvard ... While at UCSB he founded that institution's Preston Cloud Research Laboratory, originally dedicated to paleomicrobiology and to studies of the first lunar geological samples from the Apollo 11 space mission ... Cloud was a member of the National Academy of Sciences for thirty years, he was chairman of the Geology Section and occupied positions in its Council and Executive Committee ...
Entrainment (meteorology)
... Entrainment is the mixing of environmental air into a preexisting air current or cloud so that the environmental air becomes part of the current or cloud ... The entrainment coefficient in clouds is one of the most sensitive variables causing uncertainty in climate models ... that assumes that the timescale for the mixing within a cloud was large compared to the condensation timescale ...

More definitions of "cloud":

  • (noun): Out of touch with reality.
    Example: "His head was in the clouds"
  • (verb): Billow up in the form of a cloud.
    Example: "The smoke clouded above the houses"
  • (verb): Make milky or dull.
    Example: "The chemical clouded the liquid to which it was added"
  • (noun): Any collection of particles (e.g., smoke or dust) or gases that is visible.
  • (verb): Make gloomy or depressed.
    Example: "Their faces were clouded with sadness"
  • (noun): A cause of worry or gloom or trouble.
    Example: "The only cloud on the horizon was the possibility of dissent by the French"
  • (noun): Suspicion affecting your reputation.
    Example: "After that mistake he was under a cloud"
  • (verb): Make overcast or cloudy.
    Synonyms: overcast
  • (noun): A visible mass of water or ice particles suspended at a considerable altitude.
  • (verb): Colour with streaks or blotches of different shades.
    Synonyms: mottle, dapple
  • (noun): A group of many insects.
    Example: "A cloud of butterflies"
    Synonyms: swarm

Famous quotes containing the word cloud:

    Hearing the low sound
    of a cloud scattering rain
    at midnight
    and thinking for an eternity
    on his absent young wife,
    a traveller heaved a sigh
    and with a flood of tears
    howled the whole night long.
    Now, villagers won’t let him stay
    in their place anymore.
    Amaru (c. seventh century A.D.)

    To go where? In that Dark—that—in that God? a
    radiance? A Lord in the Void? Like an eye in the black cloud in a
    dream? Adonoi at last, with you?
    Allen Ginsberg (b. 1926)

    Genius detects through the fly, through the caterpillar, through the grub, through the egg, the constant individual; through countless individuals the fixed species; through many species the genus; through all genera the steadfast type; through all the kingdoms of organized life the eternal unity. Nature is a mutable cloud which is always and never the same.
    Ralph Waldo Emerson (1803–1882)