The Uncertainty Principle is largely mathematical. For any two probability densities, if one is the Fourier Transform/Inverse Fourier Transform of the other, then the product of their variances is always greater than zero. Thus, energy and time, and momentum and position, via the squared modulus of their wave functions are related in this manner. But how does orbital angular momentum (not spin) fit into the above picture? It is my understanding that orbital angular momentum can only take on values that are integer multiples of h. As always, thanks in advance.