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 →

2) Density is also how crowded or close together things are in an area (population density). tree →

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 →
• Ice floats because its density is lower than water's. tree →
• Oil has a lower density than water, so it floats on top. tree →
• Cities have a high population density. tree →
• The density of trees in the jungle makes it dark. tree →
• We compared the density of different liquids in a jar. tree →

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.
• Population density means how many people live on each square kilometre, and Bangladesh has over 1,000 while Australia has about 3.

Trees and pragmatics

Every meaning and example of «density» parsed by Mova, each sentence with its dependency tree and frames.