Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics A minor stable isotope of oxygen, 188O, having eight protons and ten neutrons; it amounts to about 0.2% of the element in nature

Etymologies

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Examples

  • Kamen used the isotope oxygen-18 to trace the chemical's role in the process, confirming that that the oxygen created during photosynthesis comes only from the water molecules.

    Kamen, Martin David

  • Naturally occurring oxygen-18 (18O) is stable and available commercially, as is water (H2O with 15% 18O).

    Oxygen

  • DMS____________Dimethyl Sulfide, a precursor of various atmospheric sulfur compounds dO18, 'ˆ‚O18_____Change in oxygen-18 isotope level

    NOAA Gridded Data « Climate Audit

  • 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

  • In this case, they found a slight excess in the abundance of oxygen-17 and oxygen-18 compared with rocks from Earth, just as we would expect from a Martian rock.

    Telegraph.co.uk - Telegraph online, Daily Telegraph and Sunday Telegraph

  • 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.co.uk - Telegraph online, Daily Telegraph and Sunday Telegraph

  • As a result, as clouds rise they become depleted in oxygen-18.

    Scientific American

  • Because water containing oxygen-18 is heavier than that containing the more common isotope oxygen-16, it falls - and condenses - more easily from clouds.

    Scientific American

  • At issue is the ratio of two stable oxygen isotopes - oxygen-16 and oxygen-18 - in lumps of carbonate mineral found in sediments from dried-out mountain lakes.

    Scientific American

  • As a result, as clouds rise they become depleted in oxygen-18.

    Scientific American

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