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PHYSICAL CONSTANTS (SI)7

Physical Quantity

Symbol

Value

Units

Boltzmann constant

k

1.3807

X

10"

23

JK-1

Elementary charge

e

1.6022

X

10"

19

C

Electron mass

me

9.1094

X

10"

31

kg

Proton mass

mp

1.6726

X

10"

27

kg

Gravitational constant

G

6.6726

X

10"

11

m3s_2kg_1

Planck constant

h

6.6261

X

10"

34

Js

 

h = h/2tt

1.0546

X

10"

34

Js

Speed of light in vacuum

c

2.9979

X

10®

 

m s_1

Permittivity of

eo

8.8542

X

10"

12

Fm-1

free space

 

 

 

 

 

 

Permeability of

Mo

4tt

X

10"

7

H m-1

free space

 

 

 

 

 

 

Proton/electron mass

mp/me

1.8362

X

103

 

 

ratio

 

 

 

 

 

 

Electron charge/mass

e/me

1.7588

X

1011

Ckg-1

ratio

 

 

 

 

 

 

Rydberg constant

4

me

Ra° ~ 8e0 W

1.0974

X

107

 

m — 1

Bohr radius

ao = eoh2 / Tvme2

5.2918

X

10"

11

m

Atomic cross section

Tvao2

8.7974

X

10"

21

m2

Classical electron radius

re = e2/47veomc2

2.8179

X

10"

15

m

Thomson cross section

(8tt/3 )re2

6.6525

X

10"

29

m2

Compton wavelength of

h/mec

2.4263

X

10"

12

m

electron

h/mec

3.8616

X

10"

13

m

Fine-structure constant

a = e2/2eohc

7.2974

X

10"

3

 

 

a-1

137.04

 

 

First radiation constant

Cl = 27rhc2

3.7418 X

10"

16

Wm2

Second radiation

C2 = hc/k

1.4388 x

10"

2

m K

constant

 

 

 

 

 

 

Stefan-Boltzmann

a

5.6705 x

10"

8

W m-2K-4

constant

 

 

 

 

 

 

Physical Quantity

Symbol

Value

Units

 

Wavelength associated

Ao = he/e

1.2398 X 10~6

m

 

with 1 eV

 

 

 

 

Frequency associated

v>o = e/h

2.4180 X 1014

Hz

 

with 1 eV

 

 

 

 

Wave number associated

ko = e/hc

8.0655 X 105

m — 1

 

with 1 eV

 

 

 

 

Energy associated with

hv o

1.6022 x 10~19

J

 

1 eV

 

 

 

 

Energy associated with 1 m~1

he

1.9864 x 10~25

J

 

Energy associated with

me3/8e02h2

13.606

eV

 

1 Rydberg

 

 

 

 

Energy associated with

k/e

8.6174 x 10~5

eV

 

1 Kelvin

 

 

 

 

Temperature associated

e/k

1.1604 x 104

K

 

with 1 eV

 

 

 

 

Avogadro number

Na

6.0221 x 1023

mol-1

 

Faraday constant

F = NAe

9.6485 X 104

C mol-1

 

Gas constant

R = NAk

8.3145

J K-1mol-1

 

Loschmidt's number

n0

2.6868 X 1025

m~3

 

(no. density at STP)

 

 

 

 

Atomic mass unit

mu

1.6605 X 10~27

kg

 

Standard temperature

To

273.15

K

 

Atmospheric pressure

po = nokTo

1.0133 X 105

Pa

 

Pressure of 1 mm Hg

 

1.3332 x 102

Pa

 

(1 torr)

 

 

 

 

Molar volume at STP

V0 = RTQ/po

2.2414 x 10~2

m3

 

Molar weight of air

Mair

2.8971 X 10~2

kg

 

calorie (cal)

 

4.1868

J

 

Gravitational

9

9.8067

m s~2

 

acceleration

 

 

 

 

Авторы: 1379 А Б В Г Д Е З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Э Ю Я

Книги: 1908 А Б В Г Д Е З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Э Ю Я