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Thread: Weighing the planet earth.

  1. #1 Weighing the planet earth. 
    Forum Cosmic Wizard
    Join Date
    Dec 2013
    Kind of a foolish little question, but who was the first person to weigh the earth and how did they get their result?

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  3. #2  
    Forum Ph.D.
    Join Date
    Mar 2014
    The Earth is in free fall so it has no weight. So, "Who was the first person to determine the mass of the Earth?"

    I always thought that it was Newton but maybe it wasn't till 1798: the British scientist Henry Cavendish.

    Cavendish experiment - Wikipedia, the free encyclopedia .27s_mass

    After converting to SI units, Cavendish's value for the Earth's density, 5.448 g cm−3, gives

    G = 6.74 10−11 m3 kg−1 s−2, which differs by only 1% from the currently accepted value: 6.67428 10−11 m3 kg−1 s−2.

    Last edited by Chucknorium; May 13th, 2014 at 10:54 AM.
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