Is the density a base unit or derived unit?

Question

and why?

I would be glad if you explain the difference.

(10 points for best answer :))

Answer 1

density = mass / volume, right?

So density uses more than one measurement.

A base unit is one that is measurable. We can only measure 7 things: length, mass, time, electric current, temperature, quantity, and luminous intensity (brightness).

Everything else we "measure" requires using more than one of these units or other units. Thus, they are derived from other measurements. Density requires two measurements (mass and volume). Speed requires two measurements - distance (length) and time. So on, so forth.

Answer 2

A Base unit is a properity that is directly measured, such as mass or volume.

A Derived unit is a property that can only be calculated based on multiple base units.

Density is a derived unit, as it is mass/volume.