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What is energy?

  1. Jan 23, 2014 #1
    Hello PF:smile:

    Up till now i have learned that something that has the ability to do force*displacement is called energy.But what is energy at a microscopic level ?
  2. jcsd
  3. Jan 23, 2014 #2


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    See last paragraph:

  4. Jan 23, 2014 #3


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    Staff: Mentor

  5. Jan 23, 2014 #4


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    I don't think it makes sense to talk about energy "at the molecular level". What in the world would the "potential energy of a rock sitting on a cliff" even mean "at the molecular level. Fundamentally, energy is a "bookkeeping" device. Every time we find a situation in which it appears that energy is NOT conserved, we define a new kind of energy to cover the difference!
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