What is cloud?

  • (verb): Make milky or dull.
    Example: "The chemical clouded the liquid to which it was added"
    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:

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 (Missour ... 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 ... 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 ...
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 counteracted by ... 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 ... the cloud's mass divided by the cloud's volume) ...
Cloud - Extraterrestrial
... Venus's thick clouds are composed of sulfur dioxide ... Mars has high, thin clouds of water ice ... Both Jupiter and Saturn have an outer cloud deck composed of ammonia clouds, an intermediate deck of ammonium hydrosulfide clouds and an inner deck of water clouds ...
Cloud Nine
... Cloud nine or on cloud nine is an idiom referring to a state of elation or happiness ... It may also refer to ...
Entrainment (meteorology)
... 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 ... mixing is a model 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): Make overcast or cloudy.
    Synonyms: overcast
  • (noun): Any collection of particles (e.g., smoke or dust) or gases that is visible.
  • (verb): Colour with streaks or blotches of different shades.
    Synonyms: mottle, dapple
  • (noun): Suspicion affecting your reputation.
    Example: "After that mistake he was under a cloud"
  • (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): A group of many insects.
    Example: "A cloud of butterflies"
    Synonyms: swarm
  • (verb): Make gloomy or depressed.
    Example: "Their faces were clouded with sadness"
  • (noun): A visible mass of water or ice particles suspended at a considerable altitude.
  • (verb): Billow up in the form of a cloud.
    Example: "The smoke clouded above the houses"

Famous quotes containing the word cloud:

    That which is given to see
    At any moment is the residue, shadowed
    In gold or emerging into the clear bluish haze
    Of uncertainty. We come back to ourselves
    Through the rubbish of cloud and tree-spattered pavement.
    These days stand like vapor under the trees.
    John Ashbery (b. 1927)

    It cannot be denied that for a society which has to create scarcity to save its members from starvation, to whom abundance spells disaster, and to whom unlimited energy means unlimited power for war and destruction, there is an ominous cloud in the distance though at present it be no bigger than a man’s hand.
    Arthur Stanley Eddington (1882–1944)

    The sea was wet as wet could be,
    The sands were dry as dry.
    You could not see a cloud, because
    No cloud was in the sky:
    No birds were flying overhead—
    There were no birds to fly.
    Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)