It is a process in which a semisolid or liquid or vapor or mixture of two or more substances is separated into its component fractions by the application or removal of heat. Important features of distillation : (a) This is a separation technique. (b) It consumes good amount of energy both in terms of cooling and heating. It depends upon (a) the difference in boiling points of the individual components of the mixture, and (b) the concentrations of the components present. List of research areas where it can be useful: Distillation List of keywords for which it should be findable: Distillation, bitumen