ìDiscoveryî of oxygen

• 1772 - Swedish Pharmacist, Scheele isolates oxygen

  • calls it "fire air"

• 1774 - English cleric, Priestley isolates oxygen

  • First hypothesized it was laughing gas
  • Later hypothesized it was dephlogistated air.

• 1774 - French chemist Lavoisier isolates oxygen

  • Hypothesized it was a very pure form of air
  • Hypothesized only formed when air was heated

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