The relationship between mass and volume of a body is described by a physical property known as density. Density is defined as the mass of an object divided by its volume. In other words, density represents how much mass is contained within a given volume.
Mathematically, density (ρ) is expressed as:
ρ = m/V
where ρ is density, m is mass, and V is volume.
The relationship between mass and volume, as governed by density, is constant everywhere in space because it is an inherent property of matter itself. Density is determined by the arrangement and composition of particles within an object, regardless of its source or location.
For example, if you have two objects with the same mass but different volumes, the object with the smaller volume will have a higher density because the mass is concentrated in a smaller space. On the other hand, if two objects have the same volume but different masses, the object with the greater mass will have a higher density because it contains more mass within the same volume.
The constancy of this relationship in space is based on the fundamental physical principles that govern the behavior of matter. Regardless of whether we are considering a human body or a planet, the mass and volume of an object determine its density. These properties are independent of the specific location or source of the object.