In earth and environmental sciences, radioactive isotopes, atom variants that decay over time, play a major role in age determination. A radioactive isotope of the inert gas argon 39, for example, is ...
LNG and LPG carrier tanks hold both a source of income and a potential source of danger. To avert the danger, inert gas systems (IGS) have been required on all new tankers over 20,000 dwt since 1978 — ...
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