4 ms·

spin? things go one direction or the other in a magnetic field

• moonchild 5y ago
  I assume that by 'you can never measure the exact position of an electron (or anything else)', they meant 'you can never measure the exact position of an electron (or the exact position of anything other than an electron)', not 'you can never measure the exact position of an electron (or any other property of an electron)'.
• pdonis 5y ago
  As moonchild posted, I was only saying that you can't measure the position of an electron exactly. I was not saying that you can't measure any properties of electrons at all. The more general statement is that you can't measure exact values for any observable with a continuous spectrum; you can only measure that a quantum system is within some finite range of values. Spin has a discrete spectrum, so you can measure exact values for spin.