Question

Explain the therotical estimation of surface free energy of solid

Answer 1

answer: let be the surface energy density of a solid cylinder of radius r and length l at high temperature and constant uniaxial tension P .

now the variation of total helmohltz free energy vanishes for this case. and we have

AND FROM ABOBE WEV CAN EASILY SAY

HERE A is surface Area of cylinder. and

A =

Now volume of the rod V=

Hence

putting the above value we get.

Which is the desired surface density of energy of solid.