Δ¹⁸O (Delta oxygen-18) is a measure of the ratio of stable isotopes of oxygen, specifically the ratio of oxygen-18 (¹⁸O) to oxygen-16 (¹⁶O). It is expressed as a difference in parts per thousand (‰) compared to a standard reference material, typically Vienna Standard Mean Ocean Water (VSMOW).

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  1. Environmental isotopes
  2. Isotopes
  3. Nuclear physics
  4. Subfields of physics
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