• Question: What is the level of nitrogen in the athosphere of the Earth ? :)

    Asked by sodiumpolyacrylate to David, James, Mike, Suze, Will on 17 Jun 2011.
    • Photo: Mike Dodd

      Mike Dodd answered on 17 Jun 2011:

      78% of the air of Earth’s atmosphere is made of Nitrogen. 21% oxygen and a little bit of other gases like CO2.

    • Photo: James Marrow

      James Marrow answered on 17 Jun 2011:

      There’s a quite detailed description of the gases at http://scifun.chem.wisc.edu/chemweek/pdf/airgas.pdf

      It tells how each of the major gases can be removed.

      You can show how much oxygen is in the air by putting a candle in a saucer of water, and then putting a glass jar over it. The candle will burn most of the oxygen, and water enters the jar to replace the oxygen, and you can measure how much the water level goes up in the jar. It’s not exact (it’s good to try to think of reasons why this is), but it’ll be close to 20%

    • Photo: Suze Kundu

      Suze Kundu answered on 17 Jun 2011:

      I’m starting to wonder whether these boys do any work – how do you all answer during the day?! Sodiumpolyscrylate, the boys are right 😛