1.Can solid solid diffuse ,if yes then how and give examples ?

2.Give 4 proofs for kinetic theory of matter?

Solids can also diffuse. put a chalk mark on black board and in five years it will be permanent. Pure lead can diffuse into pure gold. The thermal Kinetic energy causes particles in solid to vibrate and eventually diffuse although the process is slow.

The KTM is based on assumption and axioms like collisions are elastic and molecules dont attract. So it does not have a proof. although it leads to certain proofs which can be found at:http://en.wikipedia.org/wiki/Kinetic_theory