Physical constants

	(r)1-2 Name	Symbol	Units	Value
	Electron charge	$e$	C	$1.6022 \times 10^{-19}$
	Electron mass	$m_e$	Kg	$9.1094 \times 10^{-31}$
	Atomic mass unit	$m_u$	Kg	$1.6605\times 10^{-27}$
	Planck's constant	$h$	J$\cdot$s	$6.6261 \times 10^{-34}$
	Reduced Planck's constant	$\hbar = h/2\pi$	J$\cdot$s	$1.0546 \times 10^{-34}$
	Boltzmann constant	$k_{\rm B}$	J$\cdot$K$^{-1}$	$1.3806 \times 10^{-23}$
	Avogadro number	$N_A$	mol$^{-1}$	$6.0221 \times 10^{23}$
	Gas constant	$R = k_{\rm B}N_A$	J$\cdot$K $^{-1}\cdot$mol$^{-1}$	$8.3145$
	Molar volume at STP		m$^{3}\cdot$ mol$^{-1}$	$22.4 \times 10^{-3}$