Answer : Boiling and Evaporation.
Explanation : When the salt has to be separated from the salt water solution it can be simply boiled until it starts evaporating. Once the evaporation is completed which results in release of the water vapour and leaves behind the crude salt. As salt cannot be evaporated it stays back in the beaker.
This is the physical way one can use to collect the salt crystals left in the beaker from the salt water beaker.
