from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The major stable isotope of oxygen, 168O, having eight protons and eight neutrons; it amounts to over 99% of the element in nature


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  • The atomic weight of hydrogen has thus been found to be noticeably heavier than the unity which holds good with regard to the other elements in relation to oxygen-16.

    Nobel Prize in Chemistry 1922 - Presentation Speech

  • It is indeed still more remarkable that all the masses so far measured of the recently enumerated elements and several others, and also the masses of their isotopes, can be expressed by means of whole numbers in relation to oxygen-16.

    Nobel Prize in Chemistry 1922 - Presentation Speech

  • By this means there is attained what is known as a mass spectrogram, that is to say a series of lines in which each line corresponds to a certain atomic weight, and where the numerical value of each atomic weight can be read off from the distance of the line from the line or lines which are produced by any fundamental substance that is chosen as a standard - usually carbon-12 or oxygen-16.

    Nobel Prize in Chemistry 1922 - Presentation Speech

  • Other studies used the ratio of oxygen-18 to oxygen-16 δ 18O in the shells, so Mg/Ca provides a parallel measure.

    Ars Technica

  • Using an instrument called a mass spectrometer think of it as an atomic weighing machine, they studied the relative abundance in the meteorite's silicate minerals of three isotopes of oxygen - oxygen-16, oxygen-17 and oxygen-18. - Telegraph online, Daily Telegraph and Sunday Telegraph

  • Because oxygen-16 is lighter than another isotope - oxygen-18 - it is more readily released with water vapour.


  • Poulsen said that the confusion results when ratios of oxygen's two main isotopes, oxygen-18 and oxygen-16, are used to estimate past elevation.


  • Because oxygen-18 is more massive than oxygen-16, it is preferentially rained out.


  • Creatures that spend a lot of time in and around the water - like hippos and crocodiles - typically have lower oxygen-18 to oxygen-16 ratios in their bones and teeth than do landlubber counterparts nearby.

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  • During the dry season, trees take up water with more of the heavy isotope, oxygen-18, than oxygen-16.

    RedOrbit News - Technology


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