Periodic Table of the Elements
spectrum
chemicals & laboratory products
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*Mass number of most stable isotope
Solids
Gases
Liquids
Artificially Prepared
Conversion Factors for Important Physical Units
Physical Tables
Energy Equivalents
Joule
Hertz
cm–1
Kelvin
eV
Fundamental Physical Constants
Joule
Hertz
cm–1
Kelvin
eV
Quantity
Symbol
SI Value
1
6.62606876 E–34
1.98644544 E–23
1.3806503 E–23
1.602176462 E–19
1.5091905 E+33
1
2.99792458 E+10
2.0836644 E+10
2.417989491 E+14
5.03411762 E+22
3.335640952 E–11
1
0.6950356
8.06554477 E+03
7.242964 E+22
4.7992374 E–11
1.4387752
1
1.1604506 E+04
6.24150974 E+18
4.13566727 E–15
1.239841857 E–04
8.617342 E–05
1
Speed of Light (vacuum)
cO
299 792 458 m s–1 (defined)
Permeability of vacuum
µO
Permittivity of vacuum
εO = 1/(µ c )
8.854 187 817 × 10–12 F m–1
Planck Constant
h
h = h / 2π (au)
6.626 068 76 (52) × 10–34 J s
1.054 571 596 (82) × 10–34 J s
(based on the Fundamental Constants with E = mc2 = hc|λ = hv = kT and 1 eV = (e/C) J
Force Units (SI unit = Newton, cgs unit = dyne), Weight = mass × gn
N
p
kp
dyne
N
p (pond)
kp
dyne
1
0.00980665
9.80665
1.0 E–05
101.9716
1
1000
1.019716 E–03
0.1019716
1.00 E–03
1
1.019716 E–06
1.0 E+05
980.665
980665
1
Energy and Work Units (SI unit = Joule, cgs unit: 1 erg = 10 Joule)
–7
J
kp m
kWh
kcal
BTU
eV
kp m
kWh
kcal
BTU
eV
1
9.80665
3.600 E+06
4184
1055.06
1.602176 E–19
0.101972
1
3.670978 E+05
426.6493
1.075862 E+02
1.633765 E–20
2.777778 E–07
2.724069 E–06
1
1.162222 E–03
2.930722 E–04
4.450489 E–26
2.390057 E–04
2.343846 E–03
860.4207
1
2.521654 E–01
3.829293 E–23
9.478134 E–04
9.294874 E–03
3412.128
3.965651
1
1.518564 E–22
6.241512 E+18
6.120832 E+19
2.246944 E+25
2.611448 E+22
6.585169 E+21
1
Power Units (SI unit = Watt)
W
kW
kpm/s
PS
cal/s
kcal/
Elementary Charge (au)
e
1.602 176 462 (63) × 10–19 C
Electron Rest Mass (au)
me
9.109 381 88 (72) × 10–31 kg
Proton Rest Mass
mp
1.672 621 58 (13) × 10–27 kg
Proton/Electron Mass Ratio
mp / me
1836.152 6675 (39)
Neutron Rest Mass
mn
1.674 927 16 (13) × 10–27 kg
Deuteron Rest Mass
md
3.343 583 09 (26) × 10–27 kg
Atomic Mass Unit ( C/12)
mu = 1 u = 1 Da
1.660 538 73 (13) × 10–27 kg
Avogadro’s Number
NA
6.022 141 99 (47) × 1023 mol–1
Boltzmann Constant
k
1.380 6503 (24) × 10–23 J K–1
Faraday Constant
F
9.648 534 15 (39) × 104 C mol–1
Gas Constant
R
8.314 472 (15) J K–1 mol–1
12
J = N m
W = J s–1
kW
kpm/s
PS
cal/s
kcal/h
1
1.0 E+03
9.80665
745.7
4.184
1.162222
1.0 E–03
1
9.80665 E–03
0.7457
4.184 E–03
1.162222 E–03
0.1019716
101.9716
1
76.04024
0.4266493
0.1185137
1.341022 E–03
1.341022
1.315093 E–02
1
5.610835 E–03
1.558565 E–03
0.2390057
239.0057
2.343846
178.2266
1
0.2777778
0.8604207
860.4207
8.437844
641.6157
3.6
1
kp/m2
atm
bar
Torr = mmHg
at = kp/cm2
Pressure Units (SI unit = Pascal)
4π × 10–7 H m–1 (defined)
2
O O
Molar Volume (ideal gas, 0 ºC, 100 kPa) Vm = RT/p
22.710 981 (40) L mol–1
Standard Atmosphere
atm
101325 Pa (defined)
Fine Structure Constant
α = µOe2cO / 2h
1/α
7.297 352 533 (27) × 10–3
137.035 999 76 (50)
Bohr Radius (au)
aO = 4πεOh2 / mee2
0.529 177 2083 (19) × 10–10 m
Hartree Energy (au)
Eh = h / m a 4.359 743 81 (34) × 10–18 J
Rydberg Constant
R∞ = Eh / 2hcO
1.097 373 156 8548 (83) × 107 m–1
2
2
e O
Compton Wavelength (Electron)
λC = h / mecO
2.426 310 215 (18) × 10–12 m
Bohr Magneton (β, βe)
µB = eh / 2me
9.274 008 99 (37) × 10–24 J T–1
Electron Magnetic Moment
µe
–9.284 763 62 (37) × 10–24 J T–1
Electron Magnetogyric Ratio
γe = 2 µe / h
γe / 2 π
1.760 859 794 (71) × 1011 s–1 T–1
28.024 9540 (11) GHz T–1
Pa = N/m2
kp/m2
atm
bar
Pa = N/m2
1
9.80665
1.01325 E+05
1.0 E+05
0.1019716
1
1.033227 E+04
1.019716 E+04
9.86923 E–06
9.67841 E–05
1
0.9869233
1.0 E–05
9.80665 E–05
1.01325
1
7.500617 E–03
7.355592 E–02
760
750.0617
1.019716 E–05
1.0 E–04
1.033227
1.019716
Free Electron Landé g factor
ge = 2µe / µB
2.002 319 304 3737 (82)
Nuclear Magneton (βN)
µN = (me / mp) µB
5.050 783 17 (20) × 10–27 J T–1
Proton Magnetic Moment (free)
(shielded, H2O sphere, 25ºC)
µp
µp′
1.410 606 633 (58) × 10–26 J T–1
1.410 570 399 (59) × 10–26 J T–1
Torr
at = kp/cm2
133.3224
9.80665 E+04
13.59510
1.0 E+04
1.315789 E–03
0.9678411
1.333224 E–03
9.80665 E–01
1
735.5592
1.359510 E–03
1
Proton Magnetogyric Ratio (free)
(shielded, H2O sphere, 25ºC)
γp
γp′
2.675 222 12 (11) × 108 s–1 T–1
2.675 153 41 (11) × 108 s–1 T–1
Proton MR freq. in H2O
γp′ / 2π
42.576 3888 (18) MHz T–1
Electron/Proton Magn. Mom. Ratio
µe / µp
–658.210 6875 (66)
Deuteron Magnetic Moment
µd
0.433 073 457 (18) × 10–26 J T–1
Time Units (SI unit = Second)
s
min
h
d
week
year
s
min
h
d
week
year
1
60
3600
86400
604800
31556952
1.666667 E–02
1
60
1440
10080
525949.2
2.777778 E–04
1.666667 E–02
1
24
168
8765.82
1.157407 E–05
6.944444 E–04
4.166667 E–02
1
7
365.2425
1.653439 E–06
9.920635 E–05
5.952381 E–03
1.428571 E–01
1
52.1775
3.168874 E–08
1.901324 E–06
1.140795 E–04
2.737907 E–03
1.916535 E–02
1
Gravitation Constant
G
6.673 (10) × 10–11 m3 kg–1 s–2
Standard Acceleration (Earth)
gn
9.806 65 m s–2 (defined)
π = 3.141 592 653 59
e = 2.718 281 828 46 ln 10 = 2.302 585 092 99
uncertainty of last digits in ( ); source: http://physics.nist.gov/cuu/constants
Temperature Conversion (SI unit = Kelvin)
K
°C
°F
°R
Kelvin (K)
Centigrade (°C)
Fahrenheit (°F)
Rankine (°R)
1
TK = TC +273.15
TK = (5/9)(TF + 459.67)
TK = (5/9)TR
TC = TK – 273.15
1
TC = (5/9)(TF – 32)
TC = (5/9)TR – 273.15
TF = (9/5)TK – 459.67
TF =(9/5)TC + 32
1
TF = TR – 459.67
TR = (9/5)TK
TR = (9/5)(TC+ 273.15)
TR = TF + 459.67
1
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