Physical Constants

Table A.1

Constant

Symbol

Value

Units

Speed of light

c

2.99793x10®

m s_1

Gravitational constant

G

6.670X 10~n

N m 2 kg-2

Planck constant

h

6.6262X 10~34

J s

Boltzmann constant

k

1.3806X 10~23

JK-1

Stefan-Boltzmann constant

a

5.66956X 10~8

J m -2 K-4 s-1

Energy of 1 eV

Eo

1.6022X10"19

J

Wavelength of 1 eV

Ao

1239.85

nm

Atomic mass unit (12 C scale)

amu

1.66053X 10-27

kg

Astronomical unit

AU

1.49598X 1011

m

Parsec

pc

3.0857X 1016

m

Light year

ly

9.46053X 1015

m

Solar radius (mean)

RQ

6.9599X 108

m

Solar mass

MQ

1.989X1030

kg

Solar effective temperature

TQ

5777

K

Earth radius (mean)

6.371X106

m

Earth mass

M9

5.9736X 1024

kg

Earth land area

Ai

1.49X1014

m2

Earth ocean area

Ao

3.62X1014

m2

Earth rotational period

day

23.934

h

Earth orbital period

year

365.26

day

Standard surface gravity

g

9.80665

m s 2

Avogadro number

Na

6.0224X 1023

mole- 1

Universal gas constant

R

8.3143

J mole-1 K-1

Loschmidt number

Nl

2.687X1025

m-3

Standard pressure

Po

1013.25

mb

Standard temperature

To

273.15

K

Triple point of water

Tt

273.16

K

Freezing point of water

Tf

273.15

K

Atmospheric molecular weight

Md

28.964

g mole- 1

Water vapour molecular weight

Mv

18.015

g mole- 1

Specific heat capacity of dry air

Cpd

1005

J kg-1 K-1

Specific heat capacity of H2O

cpv

1850

J kg-1 K-1

IT calorie

cal

4.1868

J

Latent heat of fusion at 0 °C

Lf

79.7

cal g-1

Latent heat of vaporization at 0 °C

Lv

597.3

cal g-1

Latent heat of sublimation at 0 ° C

Ls

677.0

cal g-1

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