What does density mean?

Look below :)

Explanation:

Density: “ Density is a measure of mass per unit of volume. Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume.”

Article: https://www.sciencedaily.com/terms/density.htm

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully