Cloud

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.

Famous quotes containing the word cloud:

“Perhaps I stand now on the eve of a new life, shall watch the sun rise and disappear behind a black cloud extending out into a grey sky cover. I shall not be deceived by its glory. If it is to be so, there is work and the influence that work brings, but not happiness. Am I strong enough to face that?”
—Beatrice Potter Webb (1858–1943)

“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.)

“When the lamp is shattered,
The light in the dust lies dead;
When the cloud is scattered,
The rainbow’s glory is shed;
When the lute is broken,
Sweet tones are remembered not;
When the lips have spoken,
Loved accents are soon forgot.”
—Percy Bysshe Shelley (1792–1822)