Question

The density of brass is $8.4gcm^3$. What do you mean by this statement?

Answer 1

Hint: The term "density" refers to the amount of mass per unit of volume. An object's average density is equal to its total mass divided by its total volume. An object made of a relatively dense material (such as iron) would have less volume than one made of a less dense substance of equal mass (such as water).

Complete answer:
Temperature and pressure affect the density of a material. For solids and liquids, this variation is usually small, but for gases, it is much greater. When you apply more pressure to an object, it shrinks in volume and thus becomes denser. With a few exceptions, increasing the temperature of a material reduces its density by increasing its volume.
A substance's density is known as its mass per unit volume. Density is defined as the ratio of mass to volume.
The density of a body refers to how much matter it contains per unit of volume.
When we say that brass has a density of $8.4gm/cm^3$, we mean that $1cm^3$ of brass has a mass of 8.4g.
The density of a pure material is equal to its mass concentration in numerical terms. Different materials have different densities, which can affect things like buoyancy, purity, and packaging. At normal temperature and pressure, osmium and iridium are the densest known elements.

Note:
The inverse of a substance's density is often referred to as its real volume, a term used in thermodynamics. Mass is an intensive property, meaning that increasing the volume of a material increases its mass rather than its density.