Momentum uncertainty
= Momentum uncertainty
{title2=$\Delta p=\sqrt{\langle\hat p^2\rangle-\langle\hat p\rangle^2}$}
The <standard deviation> of the <momentum> measurement distribution of a <quantum state>. A zero mean <momentum> need not imply zero <momentum uncertainty>. For a normalized state with finite moments, position and <momentum uncertainties> obey the <Heisenberg uncertainty relation>.