bar

Name	Symbol	Quantity	SI units
bar	bar	pressure	10⁵ Pa
The bar, symbol bar, is a non-SI unit of pressure. The bar is not accepted for use with the SI. One bar is equal to 100 000 pascals, or 10⁵ N/m².
Definition			h c^-3 Δν_Cs⁴
$1 \mspace{4mu} \text{bar} \mspace{6mu} = \dfrac{(10^5)(299 \mspace{4mu} 792 \mspace{4mu} 458)^3}{(6.626 \mspace{4mu} 070 \mspace{4mu} 15 \times 10^{-34})(9 \mspace{4mu} 192 \mspace{4mu} 631 \mspace{4mu} 770)^4} \mspace{6mu} \dfrac{h \mspace{4mu} {\Delta \nu _{Cs}}^4}{c^3}\\ \\ \\ 1 \mspace{4mu} \text{bar} \mspace{6mu} \approx 5.694 \mspace{4mu} 382 \mspace{4mu} 339 \mspace{4mu} 804 \mspace{4mu} 557 \mspace{4mu} 242 \times10^{23} \mspace{6mu} h \mspace{4mu} c^{-3} \mspace{4mu} {\Delta \nu _{Cs}}^4$