Definition:Stefan-Boltzmann Constant/Value

Stefan-Boltzmann Constant: Value

$\ds \sigma$

$\approx$

$\ds 5 \cdotp 67037 \, 4419 \ldots \times 10^{-8}$

$\mathrm {W \, m^{-2} \, K^{-4} }$

$\quad$ in SI units

$\ds $

$\approx$

$\ds 5 \cdotp 67037 \, 4419 \ldots \times 10^{-5}$

$\mathrm {erg \, cm^{-2} \, s^{-1} \, K^{-4} }$

$\quad$ in CGSunits

$\ds $

$\approx$

$\ds 4 \cdotp 76 \times 10^{-13}$

$\mathrm {btu \, ft^{-2} \, \rankine^{-4} }$

$\quad$ in FPS units

1964: Milton Abramowitz and Irene A. Stegun: Handbook of Mathematical Functions ... (previous) ... (next): $2$. Physical Constants and Conversion Factors: Table $2.3$ Adjusted Values of Constants

which gives the mantissa as $5 \cdotp 669 \, 61$ with an uncertainty of $\pm 96$ corresponding to the $2$ least significant figures