Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    2017 Award

    Staff: Mentor

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


    Staff: Mentor


    The truth will set you free.

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


    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.

  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


    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.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook