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Why do we need Quantum Mechanics so much?

  1. Feb 24, 2016 #1
    Almost phenomena at macro level are classical phenomena,why physics needs QM very much?Is it rational need or practical need?
     
  2. jcsd
  3. Feb 24, 2016 #2

    fresh_42

    Staff: Mentor

    It's a rational need. Humans are built this way: they want to know!
     
  4. Feb 24, 2016 #3

    bhobba

    Staff: Mentor

    Both.

    The truth will set you free.

    Thanks
    Bill
     
  5. Feb 24, 2016 #4
    I think Chemistry,Nuclear Physics have practical needs,but how about other branch?
     
  6. Feb 24, 2016 #5

    bhobba

    Staff: Mentor

    Integrated circuits and the whole digital revolution. Transistors work on a purely quantum effect - absence of electrons, called holes, actually act like particles.

    Thanks
    Bill
     
  7. Feb 24, 2016 #6
    Quantum mechanics is a name for observable phenomena, and quantum field theory is currently the best explanation for it.
     
  8. Feb 24, 2016 #7

    e.bar.goum

    User Avatar
    Science Advisor
    Education Advisor

    The fact that this post exists at all is because of a computer which relies on quantum mechanics. Every piece of consumer electronics contains transistors, whose functioning requires quantum mechanics. Further, to communicate to someone on the other side of the world, you have used the internet which is transmitted over fiber optic cables using lasers. Those lasers exist as a result of our understanding of quantum mechanics. So, yeah, I'd say it's a practical need.

    ETA: And these are just two examples. There are hundreds more.
     
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