What Happens to Kinetic Energy During Latent Heat of Fusion?

[ghazni]

Homework Statement

dear all
i really have a foolish question to u all.
heat=i.e+p\Deltav.
now during latent heat of fusion what happens?
I mean at that point no temperature is increasd.but molecules gain rotational and translational energy as solid turns to liquid..how it is possible,please explain me in details.what happens to internal energy,as I know i.e=k.e+p.e.potential energy decreases as distance between them increases,but at melting point k.e cannot increase as temp. remain constant,but then again internal energy cannot also decrease duroing m.p.i m in atotally confused state.pls help….

Homework Equations

The Attempt at a Solution

 

[rock.freak667]

During the heating, the latent heat increases the p.e. on changing from ordered to disordered phase while keeping the same average molecular k.e. and Does a small amount of external work

 

[ghazni]

During the heating, the latent heat increases the p.e. on changing from ordered to disordered phase while keeping the same average molecular k.e. and Does a small amount of external work

i got everything of u.but frm basic physics p.e=GMm/r.when intramoleculas space increases how p.e increases?