Density
WordNet

noun


(1)   The amount per unit size
(2)   The spatial property of being crowded together
WiktionaryText

Noun



  1. A measure of the amount of matter contained by a given volume.
  2. The ratio of one quantity to that of another quantity.
    The number particles per unit volume of a specified volume can be considered to be the particle density for the specified volume.
 
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