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Is weight of earth is decreasing?

  1. Oct 22, 2012 #1
    weight of earth?

    can anyone tell me the weight of earth?
  2. jcsd
  3. Oct 22, 2012 #2


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    welcome to pf!

    hi gopu rakgarbageh! welcome to pf! :smile:
    do you mean the mass?

    if so, try wikipedia :wink:
  4. Oct 22, 2012 #3
    Re: weight of earth?

    6,000,000,000,000,000,000,000,000 kilograms.
  5. Oct 22, 2012 #4


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    Re: weight of earth?

    The weight of the Earth, as measured relative to the Sun, is of variable magnitude, because the Earth's orbit about the Sun is an ellipse.
  6. Oct 22, 2012 #5
    weight of earth is 6 x 10^24 kgs,we are burning matter,launching rockets,by this the weight of earth must decrease,is it right or wrong?
  7. Oct 22, 2012 #6
    Re: weight of earth?

    thank you
  8. Oct 22, 2012 #7


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  9. Oct 22, 2012 #8


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    Burning stuff doesn't change the mass: we start with fuel and air, and end up with ashes, smoke, and exhaust gases with the same mass.

    Launching things into space at greater than escape velocity reduces the mass of the earth, but that effect is completely insignificant and unmeasurable. 6x1024 is a really big number.

    There is a steady drizzle of infalling matter (small meteorites, random dust, the occasional much larger meteorite) that increases the earth's mass. Again, the effect is pretty much insignificant.
  10. Oct 22, 2012 #9
    Burning stuff does release a small amount of mass if some of the released energy escapes the Earth. The exothermic reaction gives off a certain amount of energy from the binding energy of the reactants. This energy has mass. But Earth is getting heavier because meteorites and sunlight itself is landing on the Earth. Some fraction of sunlight energy is converted into chemical binding energy in plants... essentially the opposite of burning them.
  11. Oct 22, 2012 #10


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    Re: weight of earth?

    I want to make sure you understand that weight and mass are NOT the same thing. Do you know the difference?
  12. Oct 22, 2012 #11
    Sure. Weight is the force that a mass feels in gravity. Mass is just energy (divided by c^2).
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