assumptions of fluid dynamics no longer apply, mass transport is governed by molecular dynamics rather than fluid dynamics. Thus, a short path between the hot surface and the cold surface is necessary, typically by suspending a hot plate covered with a film of feed next to a cold plate with a line of sight in between. Molecular distillation is used industrially for purification of oils. Gallery See also Continuous distillation Fractionating column Fractional distillation Kugelrohr References External links D1160 Vacuum Distillation How vacuum distillation works Pressure-temperature nomograph Short path distillation, includes a table comparing methods Distillation Laboratory techniques Industrial processes Vacuum