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# density

noun (density, densities)

«density» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. Density is how much mass is packed into a certain amount of space; dense things are heavy for their size. [tree →](https://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://mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/#m2)

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

## On Mova

- [Trees and pragmatics of «density» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/D/density/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«density» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/density.html) on Mova free.