\begin{definition}[Definition:Planck's Constant]
'''Planck's constant''' is the physical constant $h$ whose value is defined as:
:$h = 6 \cdotp 62607 \, 015 \times 10^{-34} \, \mathrm J \, \mathrm s$
where the units $\mathrm J \, \mathrm s$ are joule seconds.
{{Expand|Define what it is in terms of the physical constants which give rise to it, or to which it gives rise. Explain that its value is what it is because it is one of the fundamental constants of the universe which is used as one of the reference points used to define SI}}
{{ExtractTheorem}}
Physical quantities with the same dimension include angular momentum and action.
\end{definition}