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14 results about "Liquid nitrogen" patented technology

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Liquid nitrogen—LN₂—is nitrogen in a liquid state at an extremely low temperature (−195.79 °C (77 K; −320 °F) boiling point at sea level). Nitrogen was first liquefied at the Jagiellonian University on 15 April 1883 by Polish physicists, Zygmunt Wróblewski and Karol Olszewski. It is produced industrially by fractional distillation of liquid air.