Number density
Videos
The number density is an intensive quantity used to describe the degree of concentration of countable objects in physical space: three-dimensional volumetric number density, two-dimensional areal numb
Dense school of Big Eyed Scad (selar crumenophthalmus) in Kona, Hawaii
Relative density
Videos
Relative density, also called specific gravity, is a dimensionless quantity defined as the ratio of the density of a substance to the density of a given reference material. The relative density of sol
Number density
…of 1020). Using the number density of an ideal gas at 0 °C and 1 atm as a yardstick: n0 = 1 amg = 2.6867774 × 1025 m−3 is often introduced to define a relative number density (a dimensionless quantity), for any substances at any conditions (not necessarily limited to an ideal gas at 0 °C and 1 atm). Using the number density…
A United States Navy Aviation boatswain's mate tests the relative density of JP-5 fuel
An empty glass pycnometer and stopper
A filled pycnometer