Thursday, March 17, 2016

thermodynamics - Where do atoms of H and He go when they rise in the atmosphere?



What happens to atoms/molecules of H and He when we let them freely fly in atmosphere do they get into space? Is there any particular way to enumerate the 'force' that drives them upwards? Does anybody know how this force changes with their altitude/distance from Earth's surface?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...