Particles: Difference between revisions

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Particle

particle[edit | edit source]

An aggregation of sufficiently many atoms or molecules that it can be assigned macroscopic properties such as volume, density, pressure, and temperature.

But sometimes by particle, without qualification, is meant a subatomic particle such as the proton or neutron (which themselves are composed of other "elementary particles") or the electron.
See also particles.

INDEX
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
0
1
2
3
4
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9

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+#REDIRECT [[particle]]
 {{TermHeader}}
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 <div class="termentry">
    <div class="term">
-== particles ==
+== particle ==
    </div>
-<div class="definition"><div class="short_definition">Components of the [[atmosphere]] composed of solid or liquid matter.</div><br/> <div class="paragraph">Particles may be both released from the earth's surface, such as [[dust]] or [[smoke]], or formed in  the atmosphere, as in [[rain]] or [[ice]] particles or sulfate [[aerosol]]. The particles in the atmosphere are  usually defined in terms of their size, or diameter. Particles less than 100 &#x003bc;m in diameter are  referred to as aerosol particles. These are aerodynamically stable and settle out only slowly (strictly  speaking, the term aerosol refers to the gas&ndash;particle [[colloidal system]], not just the particulate  [[phase]]). The aerosol is usually divided into three modes: the Aitken mode (diameter less than 0.5  &#x003bc;m), the [[accumulation mode]] (0.5&ndash;2.0 &#x003bc;m), and the coarse mode (greater than 2 &#x003bc;m). The Aitken  and accumulation modes are collectively referred to as [[fine particles]]. The larger particles of the  coarse mode compose [[clouds]] and [[hydrometeors]] such as rain and [[sleet]], which precipitate out.  <br/>''See also'' [[particle]].</div><br/> </div>
+<div class="definition"><div class="short_definition">An aggregation of sufficiently many atoms or molecules that it can be assigned macroscopic  properties such as volume, [[density]], [[pressure]], and [[temperature]].</div><br/> <div class="paragraph">But sometimes by particle, without qualification, is meant a [[subatomic particle]] such as the  [[proton]] or [[neutron]] (which themselves are composed of other "elementary particles") or the [[electron]].  <br/>''See also'' [[particles]].</div><br/> </div>
 </div>