Two or more pure substances can be mixed together to form a mixture. An example of a mixture of two compounds is alcohol and water. An example of a mixture of elements and compounds is air. The major components of air are hydrogen, oxygen, nitrogen and carbon dioxide. The substances in a mixture can be separated physically via such methods as filtration or chromatography.
Enigma is a German musical project founded in 1990 by Romanian-German musician and producer Michael Cretu. Cretu had released several solo records, collaborated with various artists, and produced albums for his then wife, German pop singer Sandra, before he conceived the idea of a New Age, Worldbeat project.
The Enigma was by no means the only cipher machine used by the Germans during WWII. In fact the Enigma, of which over 20,000 units were produced, was mainly used at a tactical level, whilst the German High Command used other machines, such as the Siemens T-52 Geheimschreiber and the Lorenz SZ-40/42 teleprinter add-on.he history of the Enigma machine is extremely complex. There were many different models and variations, and they were used by many different customers. During the war, a mixture of military and commercial Enigma machines were used by different branches of the war machine.