- #1

- 89

- 0

I am so confused about interaction energy!

as you know, in many statistical mechanics books we see there are equations which are taken in a non-interacting system.

for example for a two particle system, you can see the total energy is:

E = E1 +E2 +E12

while E12 is the interaction energy between particle 1 and particle 2.

What I wanna know is that when can we neglect this interaction energy?

how far is interaction energy's range?

can anybody give me a formula or something for it?!!