Solid vs liquid benzoic acid

Yngevege

Basically I want to know which bondings are broken when going from the solid phase to the liquid phase.

I know that benzoic acid makes dimers (though only in gas phase, some say?) and that they have Van der Waals' forces between their rings. I tried to use my knowledge about water: Water have 4 hydrogen bonds in solid phase but less in liquid (avg 3,4?), does the same apply to benzoic acid?

Does anyone have any qualified guesses?

Basically I want to know which bondings are broken when going from the solid phase to the liquid phase.

chemisttree

The dimer is through the carboxylic groups. It is seen in the NMR if the right solvent is chosen.