| 11. | Instead, single particle identification and correlation are implemented, which set limits on particle number density.
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| 12. | Astrophysicists prefer to use number density to describe these environments, in units of particles per cubic centimetre.
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| 13. | Well the number density of dry air is about 2.5 * 10 25 m-3.
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| 14. | Count ( or number ) per liter is used to measure number density in a variety of domains.
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| 15. | Where is the atomic number density, the absorption cross section, the length of the wave vector and
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| 16. | The reaction rate ( fusions per volume per time ) is times the product of the reactant number densities:
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| 17. | The net force on a surface particle, pulling it into the container, is proportional to the number density
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| 18. | Multiply the volume by the photon number density to get the total number of photons in the observable universe.
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| 19. | The assumption here is that either the extinction coefficient \ alpha or the column number density N is known.
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| 20. | The basic distribution function uses the Boltzmann constant k and temperature T with the number density to modify the normal distribution:
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