Density describes how compact or concentrated something is. For example, suppose you have two boxes, one large and one small. However, they both weigh the same. That means the small box has a higher density than the large box.

Density also tells how concentrated or crowded something is. You may have heard of population density. In a city, there are many people packed into a small area, giving it a high population density. In a rural area, there are more fields or wooded areas between houses. That means there are fewer people living in a larger area, which is why it has a low population density.

Definitions of density
  1. noun
    the amount per unit size
    synonyms: denseness
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    bits per inch, bpi
    a measure of how densely information is packed on a storage medium
    flux, flux density
    (physics) the number of changes in energy flow across a given surface per unit area
    absorbance, optical density, photographic density, transmission density
    (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation
    low density, rarity, tenuity
    a rarified quality
    relative density
    the ratio of the density of something to the density of a standard
    specific gravity
    the density of a substance relative to the density of water
    vapor density, vapour density
    the density of a gas relative to the density of hydrogen
    type of:
    the consistency of a compact solid
  2. noun
    the spatial property of being crowded together
    synonyms: compactness, concentration, denseness, tightness
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    dispersion, distribution
    the spatial or geographic property of being scattered about over a range, area, or volume
    type of:
    spacing, spatial arrangement
    the property possessed by an array of things that have space between them
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