Constantes fisicas

Fundamental Physical Constants — Physico-chemical constants
Quantity

Symbol

Value

Unit

Relative std.
uncert. ur

Faraday constant1 NA e
molar Planck constant
molar gas constantBoltzmann constant R/NA

molar volume of ideal gas RT /p
T = 273.15 K, p = 100 kPa
Loschmidt constant NA /Vm
molar volume of ideal gas RT /p
T = 273.15 K, p = 101.325 kPa
Loschmidt constant NA /VmSackur-Tetrode (absolute entropy) constant2
5
2 3 /2
kT1 /p0 ]
2 + ln[(2πmu kT1 /h )
T1 = 1 K, p0 = 100 kPa
T1 = 1 K, p0 = 101.325 kPa
Stefan-Boltzmann constant
(π2 /60)k 4/¯ 3 c2
h
firstradiation constant 2πhc2
first radiation constant for spectral radiance 2hc2
second radiation constant hc/k
Wien displacement law constants
b = λmax T = c2 /4.965 114 231...
b = νmax /T = 2.821 439372... c/c2

NA , L

6.022 141 29(27) × 1023

mol−1

4.4 × 10−8

mu
mu c2

k/h
k/hc

Avogadro constant
atomic mass constant
1
mu = 12 m(12 C) = 1 u
energy equivalent

1.660 538921(73) × 10−27
1.492 417 954(66) × 10−10
931.494 061(21)
96 485.3365(21)
3.990 312 7176(28) × 10−10
0.119 626 565 779(84)
8.314 4621(75)
1.380 6488(13) × 10−23
8.617 3324(78) × 10−5
2.0836618(19) × 1010
69.503 476(63)

kg
J
MeV
C mol−1
J s mol−1
J m mol−1
J mol−1 K−1
J K−1
eV K−1
Hz K−1
m−1 K−1

4.4 × 10−8
4.4 × 10−8
2.2 × 10−8
2.2 × 10−8
7.0 × 10−10
7.0 × 10−10
9.1× 10−7
9.1 × 10−7
9.1 × 10−7
9.1 × 10−7
9.1 × 10−7

Vm
n0

22.710 953(21) × 10−3
2.651 6462(24) × 1025

m3 mol−1
m−3

9.1 × 10−7
9.1 × 10−7

Vm
n0

22.413 968(20) × 10−3
2.6867805(24) × 1025

m3 mol−1
m−3

9.1 × 10−7
9.1 × 10−7

S0 /R

−1.151 7078(23)
−1.164 8708(23)

σ
c1
c1L
c2

5.670 373(21) × 10−8
3.741 771 53(17) × 10−16
1.191 042 869(53) × 10−161.438 7770(13) × 10−2

W m−2 K−4
W m2
W m2 sr−1
mK

3.6 × 10−6
4.4 × 10−8
4.4 × 10−8
9.1 × 10−7

b
b

2.897 7721(26) × 10−3
5.878 9254(53) × 1010

mK
Hz K−1

9.1 × 10−7
9.1 ×...