Useful numbers, constants and relations

Table A.1 Numerical prefixes

Prefix

Symbol

Value

Prefix

Symbol

Value

Yotta

Y

1—1 О

to

Yocto

y

i—1

О

1

to

Zetta

Z

1021

Zepto

z

10-21

Exa

E

1018

Atto

a

10-18

Peta*

P

1015

Femto

f

10-15

Tera

T

1012

Pico

p

10-12

Giga

G

109

Nano

n

10-9

Mega

M

106

Micro

10-6

Kilo

k

103

Milli

m

10-3

Hecto

h

102

Centi

c

10-2

Deca

da

101

Deci

d

10-1

*The prefix Quadrillion is used in the USA energy industry to represent 1015, such as Quadrillion BTUs or Quads.

Table A.2 Energy and power conversion factors

6.242 x 1018 eV

4.184 J

1055 J

J

cal

BTU

1015 BTU

1.055 x 1018 J

745.7 W

Quad

Quad

hp

Table A.3 Useful constants

Constant

Value

Units

c

2.998 x 108

m/s

g

9.807

m/s2

кв

1.381 x 10-23

j/k

8.617 x 10-5

eV/K

h

6.626 x 10-34

J-s

4.136 x 10-15

eV-s

кв/h

2.084 x 1010

1/s-K

Na

6.022 x 1023

#/mol

R

8.315

J/mol-K = Pa-m3/mol-K

Ts

5793 (AM0)

K

5359 (AM1.5G)

K

vs

5.670 x 10-8

W/m2-K4

$sub

0.265

deg

e0

8.854 x 10-12

C/V-m

Electron properties

me

9.109 x 10-31

kg

q

1.602 x 10-19

C

Table A.4 Useful relations

Relation

Page reference

hc 1240eV A A(nm)

18

gs = nsin($sub)2 = 6.720 x 10-5

18xxxxx

A Tsmax – = 2.9 x 106 nm-K

5кв

20xxxxx

2gsk3 1.353 x 1010 h3c2 s-m2-K3

56xxxxx

kuT

Vth = B = 25.86 mV (at 300 K) q

112xxxxx

Updated: August 24, 2015 — 3:06 pm