# How do you type the h-bar(ℏ) symbol in LaTeX?

You can print the h-bar or Reduced Plank constant by default \hbar command in the latex document.

Symbol H-bar
Type of symbol Mathematics
Package (requirement) No
Argument No
Latex command \hbar
Example \hbar → ℏ

\documentclass{article}
\begin{document}
$$E = \hbar \omega$$
$$\hbar = \frac{h}{2\pi}$$
$$p = \hbar K$$
\end{document}

Output :

And different packages have the same command, which returns the same output. Examples are amsmath, fdsymbol, and boisik.

There is another type of h-bar symbol in latex that has structural light differences. For this, take help of boisik package.


\documentclass{article}
\usepackage{boisik}
\begin{document}
$$J^2 = j(j+1)^2 \hslash$$
$$J_z = m \hslash$$
$$\Delta x . \Delta p \geq \frac{\hslash}{2}$$
\end{document}

Output :

## Use another package for h-bar symbol in LaTeX like tipa, wsuipa, phonetic, etc.

The following program uses four different packages and different commands to define the same h-bar symbol.

Command (package) Symbol
\textcrh (tipa)
\crossh (wsuipa)
\plank (phonetic)
\textcrh (t4phonet)

\documentclass{article}
\usepackage{tipa, phonetic, wsuipa}
\begin{document}
$p^u = \textcrh K^u$\\[6pt]
$p^N$ = \planck $\left(\frac{w}{c}, \vec{K} \right)$\\[6pt]
\crossh = 1.056 $\times 10^{-34} J.S$
\end{document}

Output :

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