Unit operations in chemical engineering deals with the change of substances (gases, liquids, solids) by means of physical, chemical and biological processes for industrial purposes. Any chemical process, on whatever scale conducted, may be resolved into a coordinated series of operations such as pulverising, mixing, heating, roasting, absorbing, condensing, lixiviating and electrolysing. In this unit, students will learn about the 'Unit Operations' concept, which shows that this process of abstraction can be carried out by analysing unit operations in terms of fundamental principles such as mass and energy balances, phase equilibria, and transport of momentum, energy and mass.