Because of the difference in {TAIL ~ the material densities}, {HEAD ~ melt} will be accumulated at the bottom of the vessel 
Because of the difference in { TAIL ~ the material densities } , { HEAD ~ melt } will be accumulated at the bottom of the vessel
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH