• Question: What is liquid nitrogen

    Asked by 596urak29 to Duncan on 17 Nov 2017.
    • Photo: Duncan McNicholl

      Duncan McNicholl answered on 17 Nov 2017:


      Nitrogen that’s been cooled right down until it condenses, a bit like steam does if you hold a miror over a kettle while it’s boiling. It’s useful in science because of its coldness: we use it like a mega-freezer, because a normal freezer goes down to about -18 Celsius, awesome biological-specimen-keeping freezer go down to maybe -80 Celsius, but things in liquid nitrogen go down to -196 Celsius

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