| Name | Value |
| Avogadro's Number | 6.02217 E23 things/mole |
| Planck's Constant | 6.6260755 E-34 Js |
| 1 atmosphere (atm) |
101325 Pascals (Pa) = 101.325 kPa = 760 mm of Hg = 760 Torr = 1.01325 bar |
| 1 mol of any gas at STP | 22.4 L (0C, 1 atm) |
| 1 mol of any gas at SATP | 24.8 L (25C, 1 atm) |
| Ideal Gas Law Constant (R) |
0.0821 L atm/mol/K = 8.31430 L kPa /mol/K = 8.31441 J/mol/K |
| 1 calorie (cal) | 4.184 J |
| 1 Cal | 1 kcal = 1000 calories |
| 1 atomic mass unit (amu) | 1.6605665 E-24 g |
| 1 tonne(t) | 1000 kg = 1 Mg |
| Speed of light in a vacuum | 299792458 m/s (3.0 E8 m/s) |
| Rest mass of an electron (m_e) | 0.000548712 u = 9.1093897 E-28 g |
| Rest mass of a proton (m_p) | 1.00727605 u = 1.67262305 E-24 g |
| Rest mass of a neutron (m_n) | 1.008665 u = 1.674954 E-24 g |
| 1 kiloWattHour(kWh) | 3.6 MJ |
| 1 Joule(J) | 1 kg m^2 /s^2 = 1.0 E7 erg |
| 1 Coulomb(C) | 6.24 E18/e |
| Electronic charge | 1.60217733 E-19 C |
| 1 Ampere(A) | 1 Coulomb/s |
| 1 Volt(V) | 1 J/C = 96.5 kJ/mole |
| 1 electron volt (eV) | 1.60219 E-19 J |
| Faraday's Constantt | 96486.7 C/mole/e |
| Boltzmann's constant | 1.38 E-23 joule/K |
| Volume of perfect gases at 0C and 1 atm | 0.0224 m^3 |
| Magnetic momentum of electron | 9.28 E-32 joule-m^2/weber |
| Wavelength of electron(Compton) | 2.43 E-12 m |
| Density of dry air at 0C and 1 atm | 1.293 Kg/m^3 |
| Constant of the perfect gases | R = 1.98 cal/mole-K = 8.32 joules/mole-K |
| Boiling point of water | 373.15K, 100.0C, 212.0F |
| Freezing point of water | 273.15K, 0.0C, 32.0F |
| Triple point of water | 273.16K, 0.01C, 32.018F |
| Name | Value |
| Pi |
3. 141592653589793238462643383279502884197
1693993751058209749445923078164062862 |
| e (Euler Number or Napier's Constant) |
2. 71828182845904523536028747135266249775724709369995 |
| Golden Ratio | 1. 618033988749894 |
| Euler constant or gamma constant | 0. 5772156649015328 |
| Catalan constant | 0. 9159655941772190 |
| Glaisher-Kinkelin constant | 1. 282427129100622 |
| Lengyel constant | 1. 098685805525187 |
| Fibonacci factorial constant | 1. 226742010720353 |
| Champernowne number | 0. 1234567891011121 |
| Conway constant | 1. 303577269034296 |
| Porter's constant | 1. 467078079433975 |
| Niven Constant | 1. 705211140105367 |
| Khintchine Harmonic Constant | 1. 745405662407346 |
| Tribonacci Constant | 1. 839286755214161 |
| Lemniscate constant or Gauss constant | 2. 622057554292119 |
| Bernstein constant | 0. 2801694990238691 |
| Fransen-Robinson constant | 2. 807770242028519 |
| Artin constant | 0. 3739558136192022 |
| Twin primes constant | 0. 6601618158468695 |
| Laplace Limit constant | 0. 6627434193491815 |
| Euler-Mascheroni Constant | 0. 577215664901533 |
| Apery's constant | 1. 20205690315959 |
| Madelung constant | -1.747564595 |
| Brun's Constant | 1. 9021605820 |
| Wilbraham-Gibbs Constant | 1. 8519370519824661704 |
