This definition of polarization density as a dipole moment per unit volume is widely adopted though in some cases it can lead to ambiguities and paradoxes. In electromagnetism charge density is the amount of electric charge per unit length surface area or volume. Illustrated Glossary Of Organic Chemistry Term It is a low-density compound. . Helium balloons float because the density of the helium is lower than the density of air. A coulomb is a type of unit of electric charge and is equivalent to one ampere being steadily transported per one second. The structure of carbon charcoal shows a large surface area. To show these two physical properties a surfactant must have. Volume charge density symbolized by the Greek letter ρ is the quantity of charge per unit volume measured in the SI system in coulombs per cubic meter Cm 3 at any point in a volume. 16 x 10 -19 C or 16 x 10 -19 C Explanation. One of the most