density
['dɛnsətɪ]
n. 密

[] 密

[医] 密, 致密

1. The density of population in this city is very high.
   市口密非常。
2. The density of water is 1.
   密1。
3. One material can be distinguished from another by their physical properties: color, density, specific, heat and so on.
   种材种材别性：颜、密热等等。

density
[ noun ]

1. the amount per unit size

<noun.attribute>

2. the spatial property of being crowded together

<noun.attribute>

Density \Den"si*ty\ (d[e^]n"s[i^]*t[y^]), n. [L. densitas; cf.
F. densit['e].]
1. The quality of being dense, close, or thick; compactness;
-- opposed to {rarity}.

2. (Physics) The ratio of mass, or quantity of matter, to
bulk or volume, esp. as compared with the mass and volume
of a portion of some substance used as a standard.

Note: For gases the standard substance is hydrogen, at a
temperature of 0[deg] Centigrade and a pressure of 760
millimeters. For liquids and solids the standard is
water at a temperature of 4[deg] Centigrade. The
density of solids and liquids is usually called
specific gravity, and the same is true of gases when
referred to air as a standard.

3. (Photog.) Depth of shade. --Abney.