BioPHYSICAL chemistry

Constant Symbol Value SI units Non-SI units (cgs units)

Speed of light in a vacuum c 2.99792 10^8 ms−^11010 cm s−^1

Avogadro’s number NA 6.0221 1023 mol−^11023 mol−^1

Planck’s constant h 6.6262 10 −^34 Js 10 −^27 erg s

Boltzmann’s constant kB 1.38066 10−^23 JK−^110 −^16 erg K−^1

Gas constant R 8.3144 J K−^1 mol−^1107 erg K−^1 mol−^1

Faraday’s constant F 9.6487 104 C mol−^1

Bohr radius a 0 5.29177 10−^11 m1 0 −^9 cm

Rydberg constant RH 1.09737 10^7 m−^1105 cm−^1

Elementary charge e 1.60219 10−^19 C1 0 −^10 cm3/2g1/2s−^1 mol−^1

4.80298 10−^10 cm3/2g1/2s−^1 mol−^1

Electron rest mass me 9.1095 10 −^31 kg 10 −^28 g

Proton rest mass mp 1.67265 10−^27 kg 10 −^24 g

Gravitational constant G 6.6720 10 −^11 Nm^2 kg−^210 −^8 dyn cm^2 g−^2

Permittivity of a vacuum ε 0 8.85419 10−^12 kg−^1 m−^3 s^4 A^2

Bohr magneton μB 9.27401 10−^24 JT−^1

Nuclear magneton μN 5.05078 10−^27 JT−^1

Atomic mass unit 1.6605 10 −^27 kg 10 −^24 g

π 3.14159

e 2.71828

loge 10 =ln 10 2.30258 (ln x=2.30258 log 10 x)

cgs, centimeter-gram-second.

Fundamental constants

Fundamental constants

To convert from energy in units shown in the left-hand column to units shown in the top row,

multiply by the factor at their intersection.

eV cm−−^1 kcal mol−−^1 kJ mol−−^1 K erg

1 ev 1 8065 23.06 96.48 1.160 × 104 1.602 × 10 −^12

1cm−−^1 1.240 × 10 −^41 2.859 × 10 −^3 1.196 × 10 −^2 1.439 1.986 × 10 −^16

1 kcal mol−−^1 4.336 × 10 −^2 349.8 1 4.184 503.2 6.948 × 10 −^14

1kJmol−−^1 1.036 × 10 −^2 83.60 0.239 1 120.3 1.661 × 10 −^14

1 K 8.617 × 10 −^5 0.6950 1.987 × 10 −^3 8.314 × 10 −^31 1.381 × 10 −^16

1 erg 6.241 × 1011 5.034 × 1015 1.439 × 1013 6.022 × 1013 7.243 × 1015 1

Conversion factors for energy units

Conversion factors for energy units

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