---------------------------------------- Air, average molecular weight of ........................................ 29 g / mol ---------------------------------------- ---------------------------------------- Air, density of ........................................ 1.293e-3 g/cm3 ---------------------------------------- ---------------------------------------- Avogadro's number ........................................ 6.02251367e23 /mol ---------------------------------------- ---------------------------------------- Boltzmann constant ........................................ 1.380658e-23 J / K ---------------------------------------- ---------------------------------------- Earth, mass of ........................................ 5.9742e24 kg ---------------------------------------- ---------------------------------------- Earth, radius of ........................................ 6.378140e6 m ---------------------------------------- ---------------------------------------- Electron, mass of ........................................ 9.1093897e-31 kg ---------------------------------------- ---------------------------------------- Elementary charge ........................................ 1.60217733e-19 C ---------------------------------------- ---------------------------------------- Gravitational constant ........................................ 6.67259e-11 n m2 / kg2 ---------------------------------------- ---------------------------------------- Hydrogen atom, mass of ........................................ 1.6735340e-27 kg ---------------------------------------- ---------------------------------------- Light, speed of ........................................ 299792458 m /s ---------------------------------------- ---------------------------------------- Neutron, mass of ........................................ 1.6749286e-27 kg ---------------------------------------- ---------------------------------------- Permittivity of free space (vacuum) ........................................ 8.857187817e-12 F / m ---------------------------------------- ---------------------------------------- Planck's constant ........................................ 6.6260755e-34 J / Hz ---------------------------------------- ---------------------------------------- Proton, mass of ........................................ 1.6726231e-27 kg ---------------------------------------- ---------------------------------------- Rydberg constant ........................................ 1.0973731534e7 m ---------------------------------------- ---------------------------------------- Solar constant ........................................ 1368 W /m2 ---------------------------------------- ---------------------------------------- Stefan-Boltzmann constant ........................................ 5.67051e-8 W / m2 K4 ---------------------------------------- ---------------------------------------- Sun, luminosity of ........................................ 3.827e26 W ---------------------------------------- ---------------------------------------- Sun, mass of ........................................ 1.9891e30 kg ---------------------------------------- ---------------------------------------- Sun, radius of ........................................ 6.96e8 m ---------------------------------------- ---------------------------------------- Universal gas constant ........................................ 8.314 m3 Pa / mol K ---------------------------------------- ---------------------------------------- Water, critical point of ........................................ 374.3 degrees Celsius at 218 atm ---------------------------------------- ---------------------------------------- Water, density of ........................................ 1 g / cm3 1000 kg / m3 62.174 lbm / ft3 ---------------------------------------- ---------------------------------------- Water, heat of fusion of ........................................ 3.3375e5 J / kg ---------------------------------------- ---------------------------------------- Water, Kf for ........................................ 1.86 degrees Celsius Kg water / mol solute ---------------------------------------- ---------------------------------------- Water, triple point of ........................................ 4 degrees Celsius at 0.01 atm ---------------------------------------- ---------------------------------------- Year, sidereal ........................................ 365.256366 days ----------------------------------------