The larger value uses Planck’s original quantity, h, while the smaller, more common value uses a parameter called h-bar, which is h divided by 2 pi. Whichever value is used, the result is a time ...

With quantum mechanics, a new constant of nature emerged-the Planck constant, h, or h-bar. When we combine these constants we get various so-called Planck units. These units tell us where quantum ...