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Plentiful as they are, these solid compounds are not useful as sources of oxygen, because separation of the element from its tight combinations with the metal atoms is too expensive. Britannica Quiz Facts You Should Know: The Periodic Table Quiz Below −183 °C (−297 °F), oxygen is ...
Britannica Quiz Facts You Should Know: The Periodic Table Quiz When incorporated in small amounts intoglass, selenium serves as a decolorizer; in larger quantities it imparts to glass a clear red color that is useful in signal lights. The element is also employed in making red enamels for ...
Two other methods of measuring the strain on an object arephotoelasticityandstress-analysis holography. Photoelasticity provides a visual method of observing the strain on an object by viewing the effects of polarized light on a bi-refringent (double-refracting) material bonded to the object. As ...