(integral relating pressure to a gas's characteristics)
The pressure integral relates a gas's pressure to
particle momenta and density.
P = 1/3 ∫ nppv dp
- P - pressure.
- p - momentum.
- npdp - number of particles per unit volume with momentum p.
- v - velocity of the particle (with the given momentum).
This form applies to any particles with momenta, and can be applied
photons for light pressure as well as molecules.