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…showed last 75 words of 311 total…used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes. Calcium obviously plays a very important role in our lives. It is very essential for us to live, affecting our bones, teeth, blood and health. It is important to our environment creating other chemicals and things that are useful to us. Calcium is in great demand by a number of industries, and is essential for life.