Therefore, the total collision frequency, of all A molecules, with all B molecules, is:

Z is the collision frequency.

The fluid equations are not closed without the determination of transport coefficients such as mobility, diffusion coefficient, averaged collision frequencies, and so on.

Thus, stirring affects collision frequency.

Due to the high collision frequency of the particles in the source, the plasma is in thermal equilibrium and reasonably homogeneous.

It can also be defined as the ratio between the preexponential factor and the collision frequency, and it is most often less than unity.

However, studies have suggested that even the existing ITU requirements are not enough to have a major effect on collision frequency.

In plasma physics, collisionality is a dimensionless parameter proportional to the electron-ion collision frequency.

The turbulence increases the collision frequency between the water drops.

Although collision frequency is greater at higher temperatures, this alone contributes only a very small proportion to the increase in rate of reaction.