Showing content from http://www.astronomynotes.com/tables/tablesa.htm below:
Tables
Quantity Value speed of light (c) 299,792.458 kilometers/second gravitational constant (G) 6.6726× 10-11 m3 /(kg sec2) Boltzmann constant (k) 1.380658 × 10-23 Joules/Kelvin Stefan-Boltzmann constant (s) 5.67051× 10-8 J/(m2 K4 s) Wien's law constant 2.897756× 106 nanometers Kelvin Planck constant (h) 6.6260755× 10-34 Joules second electron mass 9.1093898× 10-28 grams
= 5.48579903× 10-4 amu proton mass 1.6726231× 10-24 grams
= 1.007276470 amu neutron mass 1.6749286× 10-24 grams
= 1.008664904 amu deuterium nucleus mass 3.3435860× 10-24 grams
= 2.013553214 amu
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