Mass is the quantity of matter that a body possesses as measured by its inertia. Volume, on the other hand, is [space occupied] as measured by cubic units

density

There's no mass control on your tv set

1) A volume is an amount of three dimensional space. It is a geometrical value. A volume is the finite amount of space around a given point, limited with a surface. It is the amount of space *inside* the surface, as long as the surface divides an inside and an outside. The volume of some well known geometrical figures can be calculated with formulas. A mass is an amount of matter. It is a physical value. If we consider matter as made of atoms, it can theoretically be evaluated by just counting mainly the number of protons, neutrons (and for a better approximation, also the smallest particles) in this amount of matter. (The mass of those individual particles is well-known). Here again, we can consider an amount of space (volume) and all the matter contained there. However, in the general case where we don't have a closed boundary, the amount of matter inside a given volume will change with time. The same amount of space could contain different amounts of mass (matter). The quotient mass through volume is the average density inside this volume. 2) "The volume of any solid, liquid, or gas is how much three-dimensional space it occupies, often quantified numerically. One-dimensional figures (such as lines) and two-dimensional shapes (such as squares) are assigned zero volume in the three-dimensional space. Volumes of straight-edged and circular shapes are calculated using arithmetic formulae. Volumes of other curved shapes are calculated using integral calculus, by approximating the given body with a large amount of small cubes or concentric cylindrical shells, and adding the individual volumes of those shapes. The volume of irregularly shaped objects can be determined by displacement. If an irregularly shaped object is less dense than the fluid, you will need a weight to attach to the floating object. A sufficient weight will cause the object to sink. The final volume of the unknown object can be found by subtracting the volume of the attached heavy object and the total fluid volume displaced. The generalization of volume to arbitrarily many dimensions is called content." Source and further information: http://en.wikipedia.org/wiki/Volume 3) "Mass is a fundamental concept in physics, roughly corresponding to the intuitive idea of how much matter there is in an object. Mass is a central concept of classical mechanics and related subjects, and there are several definitions of mass within the framework of relativistic kinematics (see mass in special relativity and mass in General Relativity). In the theory of relativity, the quantity invariant mass, which in concept is close to the classical idea of mass, does not vary between single observers in different reference frames. In everyday usage, mass is more commonly referred to as weight, but in physics and engineering, weight means the strength of the gravitational pull on the object; that is, how heavy it is, measured in units of force. In everyday situations, the weight of an object is proportional to its mass, which usually makes it unproblematic to use the same word for both concepts. However, the distinction between mass and weight becomes important for measurements with a precision better than a few percent (due to slight differences in the strength of the Earth's gravitational field at different places), and for places far from the surface of the Earth, such as in space or on other planets." Source and further information: http://en.wikipedia.org/wiki/Mass 4) Further information: - Measuring Mass and Volume: http://www.visuallearningco.com/guides/Tools_in_Science/Measuring_Mass_and_Vol_Guide.pdf - Comparing volume, mass, and weight: http://msnucleus.org/membership/html/k-6/as/scimath/3/assm3_6a.html