* Density is a measure of how much mass is contained in a given volume. It's a fundamental characteristic of the material itself, not the shape or size of the object.

* The same substance will always have the same density. For example, a block of gold and a gold coin will have the same density even though they have different shapes and sizes.

* Objects made of different substances can have different densities. A block of wood and a block of iron will have different densities, even if they are the same size and shape.

In summary: Density is an intrinsic property of a substance, meaning it's a characteristic that is inherent to the material itself, regardless of the object's form or size.