Quote Originally Posted by Ritzi Lee
In the Quantum Mechanical world, the idea that we can measure things exactly breaks down. Let me state this notion more precisely. Suppose a particle has momemtum p and a position x. In a Quantum Mechanical world, I would not be able to measure p and x precisely. There is an uncertainty associated with each measurement, e.g., there is some dp and dx, which I can never get rid of even in a perfect experiment!!!. This is due to the fact that whenever I make a measurement, I must disturb the system. (In order for me to know something is there, I must bump into it.) The size of the uncertainties are not independent, they are related by

dp x dx > h / (2 x pi) = Planck's constant / ( 2 x pi )

The preceding is a statement of The Heisenberg Uncertainty Principle. So, for example, if I measure x exactly, the uncertainty in p, dp, must be infinite in order to keep the product constant.


:clap:

My time Machine is almost ready. No need to worry about the future no more. I'm gonna transport us all back to 1992.