Disclaimer : Im not a physicist!
I have heard Loschmidt's paradox described as "the laws of thermodynamics are time asymmetric because entropy always increases, but the underlying laws of physics are symmetric under time reversal."
Could someone explain the main difference between thermodynamics (is this the same as Kinetic Theory or Statistical Mechanics?) and the 'underlying laws of physics' - which I assume they mean Molecular Dynamics.
Maybe reference to Figure 1 on page 2 of this http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.97.2226 could help me. Some main differences :
- What size scale do they work on?
- How many bodies (or particles) are there usually in the systems they describe?
- Do they describe different physical phenomena?
- Can one pass between the two, i.e do the theories agree?