Density: How Much Is Packed Into a Space
Density is mass divided by volume. The word also describes how tightly people, buildings or information are packed, and informally it means stupidity.
Density measures how much of something occupies a given space. In physics it explains why things float: an object less dense than water rises in it, whatever its size, which is why a steel ship floats and a steel nail does not.
- Mass per unit volume. *The density of lead is high.*
- How crowded something is. *Population density.*
- How closely packed information is. *Data density.*
- Stupidity (informal). *The sheer density of the reply.*
Word forms
| Form | Word | Example |
|---|---|---|
| Noun | density | High density. |
| Adjective | dense | A dense fog. |
| Adverb | densely | Densely populated. |
| Related | condense | Condense the report. |
| Opposite | sparse | Sparse vegetation. |
How it is used in a sentence
- Bangladesh has a very high population density.People per square kilometre.
- The fog was dense enough to close the airport.The adjective.
- The text is dense but rewarding.Packed with meaning, and demanding to read.
Why density decides what floats
- Water has a density of about 1 gram per cubic centimetre
- Anything less dense floats in it; anything more dense sinks
- Ice is less dense than water, which is why lakes freeze from the top down
- A ship floats because its hull encloses air, lowering its average density
- Size is irrelevant: a tiny pebble sinks and a vast ship does not
From Latin *densitas*, from *densus*, thick or crowded. The insulting sense of dense — slow to understand — dates from the nineteenth century, and pictures a mind too thick for ideas to get through.
Density or weight?
Weight is how heavy something is in total. Density is how heavy it is for its size, which is what determines whether it floats.
Is calling someone dense rude?
Yes, though mildly. It suggests slow understanding rather than lack of intelligence.