# Atomic Number Density

on . Posted in Chemical Engineering

Atomic number density, abbreviated as $$\eta$$  (Greek symbol eta), is the number of atoms of a particular element per unit volume of a substance.  It is a measure of how closely packed atoms are within a material.  The atomic number represents the number of protons in the nucleus of an atom of that element.  Therefore, the atomic number density is specific to a particular element and reflects how many atoms of that element are present in a given volume.

Atomic number density is used in various scientific and engineering fields, such as materials science, physics, and chemistry, where understanding the distribution and arrangement of atoms within a material is essential for predicting its properties and behavior.

### Atomic Number Density formula

$$\eta = N \;/\; V$$     (Atomic Number Density)

$$N = \eta \; V$$

$$V = N \;/\; \eta$$

Symbol English Metric
$$\eta$$  (Greek symbol eta) = atomic number density  $$atoms \;/\; in^3$$  $$atoms \;/\; mm^3$$
$$N$$ = total number of atoms of the element $$dimensionless$$
$$V$$ = volume of substance $$in^3$$ $$mm^3$$