This paper discusses the understanding of measurement concept in classical mechanics and quantum mechanics.

I just wrote more than n, but when I submitted it, I found that I didn't log in or save it ~ ~ I'm so angry!

Now briefly. The biggest difference between quantum mechanics and classical theory is influenced by the uncertainty principle (formally named "uncertainty principle"), because the means used in measurement, such as electron imaging and photon imaging, are all based on this imaging principle of bombarding the measured object and then receiving feedback. This is not wrong in the macro field, because the influence of electrons or photons on the measured object can be ignored, and we can get accurate results. But quantum mechanics doesn't work, because the scale of the measured object is comparable to what you use. You can think about the error caused by bombarding electrons. Even the measured object can't be found after bombardment!