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# Constants, Physical Quantities, and Conversion Factors

 Name Symbol Value Astronomical unit (mean distance between the Sun and Earth) RSE 1.496×1011 m Avogadro’s number NAv 6.023×1023 molecules/mol Boltzmann constant kB 1.381×10−25 J/K Electron charge q 1.602×10−19 C Electronvolt eV 1.602×10−19 J Energy of 1 μm photon 1.240 eV Free electron mass m0 9.109×10−31 kg Permitivity of free space ε0 = 107/4πc2 8.854×10−12 F/m Permeability of free space μ0 = 4π 10−7 1.257×10−6 H/m Plank’s constant h 6.625×10−34 J.s ħ = h/2π 1.055×10−31 J.s Radius of the Sun Rs 6.96×108 m Thermal voltage at 300 K VT = kBT/q 25.9 mV Solid angle subtended by the Sun ωs 6.85×10−5 sterad fω = ω ...

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