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1. Number Density

   Linked via "vacuum systems"

   $$n = \frac{\Delta N}{\Delta V}$$
   The standard SI unit for number density is the inverse cubic meter ($\text{m}^{-3}$). In contexts involving particle physics or astrophysics, it is often expressed in units of per cubic centimeter ($\text{cm}^{-3}$) or inverse cubic parsec ($\text{pc}^{-3}$), reflecting the vast scales encountered in vacuum systems or interstellar medium studies [1].
   Theoretical Foundations and Units