Definition:Reduced Planck Constant

Definition

The reduced Planck constant is the physical constant $\hbar$ which is derived from Planck's constant by dividing it by $2 \pi$:

$\hbar = \dfrac h {2 \pi}$

Value

\(\ds \hbar\)

\(=\)

\(\ds 1 \cdotp 05457 \, 1817 \ldots \times 10^{-34} \, \mathrm {J \, s}\)

This sequence is A254181 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008).

\(\ds \)

\(=\)

\(\ds 1 \cdotp 05457 \, 1817 \ldots \times 10^{-27} \, \mathrm {erg \, s}\)

Symbol

$\hbar$

The symbol for the reduced Planck constant is $\hbar$.

The $\LaTeX$ code for \(\hbar\) is \hbar .

Also known as

The reduced Planck constant can also be seen referred to as:

• Planck's reduced constant
• the Dirac constant, for Paul Adrien Maurice Dirac

Also see

• Definition:Planck's Constant

Source of Name

This entry was named for Max Karl Ernst Ludwig Planck.

Sources

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