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# density

«density» in Mova's school dictionary: **how much mass is packed into a certain amount of space…** — its meaning for a pupil, its sense in the lessons and examples, with 2 sentences of Mova's corpora that use it.

### part of speech

noun (density, densities)

### meaning for a pupil

1) Density is how much mass is packed into a certain amount of space; dense things are heavy for their size. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/#m1)

2) Density is also how crowded or close together things are in an area (population density). [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/#m2)

### sense in the lessons

In science, density explains why things float or sink: wood is less dense than water so it floats, a stone is denser so it sinks; oil floats on water. In maths and geography, population density is the number of people per square kilometre, found by dividing people by area. Phrases: high density, low density, population density, density of water.

### examples

- Lead has a very high density. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/#x1)
- Ice floats because its density is lower than water's. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/#x2)
- Oil has a lower density than water, so it floats on top. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/#x3)
- Cities have a high population density. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/#x4)
- The density of trees in the jungle makes it dark. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/#x5)
- We compared the density of different liquids in a jar. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/#x6)

### note

Mostly uncountable; countable when comparing (different densities). Adjective: dense. In maths: density = mass ÷ volume; population density = number of people ÷ area. Trap: a big object is not always dense; a large ball of cotton wool has low density.

### In the corpora

- [Density means how much stuff is packed into the same space.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/7-oil-and-water/14/)
- [Population density means how many people live on each square kilometre, and Bangladesh has over 1,000 while Australia has about 3.](https://md.mova.elamur.ai/free/en/corpora/school/geography/24-population-and-cities/17/)

### Trees and pragmatics

[Every meaning and example of «density» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/), each sentence with its dependency tree and frames.