Here's a breakdown:

* Density is a physical property of matter that describes how much mass is contained in a given volume.

* It's calculated by dividing the mass of a substance by its volume: Density = Mass / Volume

For example, if you have a block of wood that weighs 10 grams and takes up a space of 20 cubic centimeters, its density would be:

* Density = 10 grams / 20 cubic centimeters = 0.5 grams per cubic centimeter.

Key Points:

* Density is a constant value for a specific substance at a given temperature and pressure.

* It can be used to identify substances, as different substances have different densities.

* Density is an important concept in many fields, including physics, chemistry, and engineering.

Let me know if you have any other questions.