Basic Terms and Concepts in Vacuum Technology
      Back to home
      1. Vacuum Academy Knowledge Center
      2. Quantities, their Symbols, Units of Measure and Definitions
      3. Basic Terms and Concepts in Vacuum Technology

      What is the definition of Particle Number Density?

      The number of particles, N, is plainly a count of particles (atoms or molecules) and is a unitless number. The number of particles in 1 mole of a substance is 6.022 x 10²³, which is called Avogadro's number.