Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The most abundant of the two stable isotopes of carbon, 126C, having six protons and six neutrons; it is the standard for atomic weight and is used to define the mole.

Etymologies

Sorry, no etymologies found.

Examples

  • Most of the carbon in the atmosphere’s carbon dioxide is carbon-12, which is not radioactive.

    THE GREATEST SHOW ON EARTH

  • Alpha particles from the decay cause a release of neutrons from the beryllium as it turns to carbon-12.

    Nuclear power reactor

  • The strongest evidence comes from measurements of the isotopic signature of carbon dioxide -- the amount of carbon-12, -13, and -14 in the atmosphere.

    David Roberts: Huffington Post Blows It With Recycled Climate Skeptic Nonsense

  • So plants take in carbon-14 alongside carbon-12, and incorporate the two kinds of carbon atom in sugars, in the same proportion as they exist in the atmosphere.

    THE GREATEST SHOW ON EARTH

  • The ratio of carbon-14 to carbon-12 in the specimen therefore gradually drops further and further below the standard ratio that living creatures share with the atmosphere.

    THE GREATEST SHOW ON EARTH

  • And the ratio of carbon-12 to carbon-14 can be used to calculate the time that has elapsed since the death of the creature cut it off from the food chain and its interchange with the atmosphere.

    THE GREATEST SHOW ON EARTH

  • Eventually it will be all carbon-12 – or, more strictly, the carbon-14 content will become too small to measure.

    THE GREATEST SHOW ON EARTH

  • And Prototaxites displayed a much wider variation in its ratio of carbon-12 to carbon-13 content than would be expected in any plant.

    Archive 2007-04-01

  • Deriving their energy from the sun and their carbon from carbon dioxide in the air, any given type of plant will typically contain a similar ratio of carbon-12 to carbon-13 as another plant of the same type.

    Archive 2007-04-01

  • Dr. Robert Holloway, whose heading to his article reveals his agenda immediately, quotes someone called Major a creationist: Modern radiocarbon dating assumes that the carbon-14/carbon-12 ratio in living organisms is the same now as it was in ancient organisms before they died.

    Archive 2009-06-01

Wordnik is becoming a not-for-profit! Read our announcement here.

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.