# Why doesn't velocity enter into Heisenberg's Uncertainty Principle?

So I came across Heisenberg's uncertainty principle in my 11th grade book, and I'm not convinced. It says $\Delta x \Delta p \gt \frac{h}{4\pi}$. Okay, but how does velocity even matter to determine the path?

Now suppose we have, for the case of my argument, 100 exactly identical atoms of hydrogen. Now we find the positions of the lone electron in 100 different cases, and we can do it with 100% accuracy. Now, if we join the dots, won't we get the path of the electron? Why not? Please explain in simple words if you can.

• You're trying to apply your macroscopic intuition to a microscopic event. In your proposal, why do you think you know the path between two measurements? In fact, you have no idea what the momentum at each of those points is at all. And more importantly, you cannot determine position with 100% accuracy. That's the point.
– Zhe
Commented Oct 27, 2017 at 16:34
• You don't need to be convinced. Nature works this way regardless of whether you're convinced or not.
– Zhe
Commented Oct 27, 2017 at 16:34
• Colleagues, please refrain from close-voting and downvoting. Neither of us was born with the full knowledge of the subject. The question is completely legitimate and shows some genuine (if mistaken) work of the mind; if this is not welcome here, then I don't know what is. Commented Oct 27, 2017 at 17:39
• I was just responding to your phrasing. It seems very arrogant to say that you're "not convinced" of 100 years of physics built by arguably some of the smartest humans who have ever walked the earth and survived every single attempt to prove it wrong.
– Zhe
Commented Oct 27, 2017 at 18:58
• My bad, I wasn't convinced as I thought from experience that probably 2 years from now in college they'll tell me that it was something dumbed down so that we could understand, like dual nature for example. Commented Oct 27, 2017 at 19:02