Moving up and on! Two years after his ex-girlfriend Kristen Stewart cheated on him, Robert Pattinson showed that he was long over the scandal by laughing it off in an interview for the September 2014 issue of Esquire UK.
adjective, purer, purest. 1. free from anything of a different, inferior, or contaminating kind; free from extraneous matter: pure gold; pure water. 2. unmodified by an admixture; simple or homogeneous. 3. of unmixed descent or ancestry: a pure breed of dog.
A substance containing only one type of atom or one type of molecule is a pure substance. Most of the matter around us, however, consists of mixtures of pure substances. Air, wood, rocks and dirt are examples of such mixtures. Mixtures can be classified as Homogeneous and Heterogeneous.