Chemistry Reference
In-Depth Information
Appendix D: Common
Fundamental Constants
Angstrom, Å = 10
−8
cm = 10
−10
m
Micrometer, μm = 10
−6
m
Boltzmann constant, k
B
= 1.381 × 10
−23
J K
−1
Electronic charge, e = 1.602 × 10
−19
C
Ideal gas law: P V = k T = 4.12 × 10
−22
1 J at 298 K (25°C)
1 cal = 4.184 J
1 erg = 10
−7
J
1 atm = 1.013 × 10
5
N m
−2
(Pa)
kT/e = 25.7 mV (at 25°C)
Permittivity of free space, eo = 8.854 × 10
−12
C
2
J
−1
m
−1
eV = 1.6021 10
−19
J
Kilowatt hour = kWh = 3.6 10
6
J
Viscosity of water = 0.001 N s m
−2
= 1 at 20°C
Dielectric constant of water = 80.2 at 20°C
239