Mass is the product of density and volume (m = D x V) while density is ratio of mass per volume (D = m / V). Summary: 1.Mass is how much matter is present in a particular object. 2.Density is how much mass is present per unit of volume.
asâ¢sert /ÉËsÉrt/USA pronunciation v. [~ + object] 1  to state strongly or positively; declare strongly:asserted his innocence.[~ + (that) clause]asserted that he was innocent of the crime. 2  to make a claim to:Minorities are now asserting their right to be heard.
verb (used with object) 1. to demand by or as by virtue of a right; demand as a right or as due: to claim an estate by inheritance. 2. to assert and demand the recognition of (a right, title, possession, etc.); assert one's right to: to claim payment for services.