In physics, what is defined as mass per unit volume?
Distribution function (physics) Distribution function (physics) In molecular kinetic theory in physics, a particle's distribution function is a function of seven variables, formula_1, which gives the number of particles per unit volume in single-particle phase space. It is the number of particles per unit volume having approximately the velocity formula_2 near the position formula_3 and time formula_4. The usual normalization of the distribution function is where, "N" is the total number of particles, and "n" is the number density of particles – the number of particles per unit volume, or the density divided by the mass of individual particles. A distribution function may
Milli mass unit mass unit "u" has been defined as 1/12 the mass of C. Before that the atomic mass unit "amu" was defined as 1/16 the mass of O (physics) and as 1/16 the mass of O (chemistry). Thus the publication date in literature ought to be heeded when reading about the milli mass unit as its name does not reveal whether it refers to the old amu or the newer u. The mass excess is usually indicated in mu or mmu. In mass spectrometry the mass accuracy of a mass analyzer is often indicated in mu, even though a more correct