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The "density" of something is a measure of how much it weighs (technically, its mass) per amount of space it takes up (its volume). The formula for density is

Density = mass/volume.

So something that is very heavy but doesn't take up much space (like lead) is considered to have a high density, but something that is light and takes up a lot of space (like feathers) has a low density. So the word "dense" usually refers to things that have a high density.

It is also commonly used colloquially to refer to somebody who is maybe a bit slow to understand things (a reference to their skull being dense, thus not allowing much in or out of their brains).

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9y ago

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