Multiple choice

Who invented liquid oxygen?

  1. Maria Montessori

  2. Dewar

  3. Priestly

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

James Dewar developed the vacuum flask (Dewar flask) for storing liquid gases including liquid oxygen. While he didn't 'invent' liquid oxygen itself (which occurs naturally), he pioneered methods for its liquefaction and storage.

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