Quantity

Unit

formula

radiant intensity

watt per steradian

W/sr

specific heat

joule per kilogram-kelvin

J/kg^K

stress

pascal(Pa)

N/m2

thermal conductivity

watt per metre-kelvin

W/m<

velocity

metre per second

m/s

viscosity, dynamic

pascal-second

Pa^s

viscosity, kinematic

square metre per second

m2/s

voltage

volt (V)

W/A

volume

cubic metre

m3

wavenumber

reciprocal metre

(wave)/m

work

joule (J)

N^m

Multiplication factors

Prefix

SI Symbol

1 000 000 000 000 = 1012

tera

T

1 000 000 000 = 109

giga

G

1 000 000 = 106

mega

M

1 000 = 103

kilo

k

100 = 102

hecto*

h

10 = 101

deka*

da

0,1 = 10-1

deci*

d

0,01 = 10-2

centi*

c

0,001 = 10-3

milli

m

0,000 001 = 10-6

micro

H

0,000 000 001 = 10-9

nano

n

0,000 000 000 001 = 10-12

pico

p

0,000 000 000 000 001 = 10-15

femto

f

0,000 000 000 000 000 001 = 10-18

atto

a

* To be avoided where possible.

THE PHONETIC ALPHABET

A

B

C

D

E

F

G

H

I

Alpha

Bravo

Charlie

Delta

Echo

Foxtrot

Golf

Hotel

India

J

K

L

M

N

O

P

Q

R

Juliet

Kilo

Lima

Mike

November

Oscar

Papa

Quebec

Romeo

S

T

U

V

W

x

Y

Z

Sierra

Tango

Uniform

Victor

Whiskey

X-ray

Yankee

Zulu

THE GREEK ALPHABET

Ad

BP

Гу

Д5

Еє

zc

Hr)

0i5

Alpha

Beta

Gamma

Delta

Epsilon

Zeta

Eta

Theta

II

Kk

AX

M|i

Nv

Oo

Птс

Jota

Kappa

Lambda

My

Ny

Xi

Omikron

Pi

Pp

£a

Tx

Yu

Фф

xx

Поз

Rho

Sigma

Tau

Ypsilon

Phi

Chi

Psi

Omega

General conversion factors

Unit

Conversion to

Multiply by

Reciprocal

Linear Measure

mil (0,001 inch)

millimetre

0,0254

39,37

inch

millimetre

25,4

0,03937

foot

metre

0,3048

3,281

yard

metre

0,9144

1,0936

mile

kilometre

1,6093

0,6214

nautical mile

kilometre

1,8532

0,5396

Square Measure

square inch

square millimeter

645,2

0,00155

square inch

square centimeter

6,452

0,155

square foot

square metre

0,0929

10,764

square yard

square metre

0,8361

1,196

acre

square metre

4047,

0,0002471

acre

square foot

43560,

0,00002296

square mile

acre

640,

0,001562

square mile

square kilometer

2,590

0,3863

Volume

cubic inch

cubic centimeter

16,387

0,06102

cubic foot

cubic metre

0,02832

35,31

cubic foot

gallon (U. S.)

7,48

0,1337

cubic foot

litre

28,32

0,03531

cubic yard

cubic metre

0,7646

1,3079

ounce (U. S., liq.)

cubic centimeter

29,57

0,03382

quart (U. S., liq.)

litre

0,9464

1,0566

gallon (U. S.)

gallon (Imperial)

0,8327

1,2009

gallon (U. S.)

litre

3,785

0,2642

barrel (U. S.Petroleum)

gallon (U. S.)

42,

0,0238

barrel (U. S.Petroleum)

litre

158,98

0,00629

Mass

grain

milligram

64,8

0,01 543

ounce (oz)

gram

28,35

0,03527

pound (lbs)

kilogram

0,4536

2,205

short ton

metric ton

0,9072

1,1023

long ton

metric ton

1,0161

0,9842

Pressure or Stress

pound force per inch2 (psi)

pascal

6895,

0,0001450

kip per inch2 (ksi)

megapascal

6,895

0,145

pound force per inch2 (psi)

bar

0,06895

14,50

kip per inch2

kilogram per millimetre2

0,7031

1,4223

atmosphere

mm Hg

760,

0,001316

atmosphere

pound force per inch2

14,696

0,06805

Unit

Conversion to

Multiply by

Reciprocal

Pressure or Stress (Cont.)

atmosphere

bar

1,013

0,9872

atmosphere

megapascal

0,1013

9,872

torr (mm Hg)

pascal

133,32

0, 007501

inch of water

pascal

248,8

0,004019

foot of water

pound force per inch2

0,4335

2,307

dyne per centimetre2

pascal

0,1000

10,00

Work, Heat and Energy

British thermal unit (Btu)

joule

1055,

0,0009479

foot pound-force

joule

1,356

0, 7375

calorie

joule

4,187

0,2389

Btu

foot pound-force

778,

0,001285

kilocalorie

Btu

3,968

0,252

Btu

kilogram metre

107,56

0,009297

Btu per hour

watt

0,2929

3,414

watthour

joule

3600,

0,0002778

horse power

kilowatt

0,7457

1,341

Miscellaneous

pound per gallon (U. S.)

gram per litre

119,8

0,00835

pound mole (gas)

cubic foot (STP)

359,

0,00279

gram mole (gas)

litre (STP)

22,4

0,0446

board foot

cubic metre

0,00236

423,7

milliampere per foot2

milliampere per metre2

10,76

0,0929

gallons (U. S.) per minute

metre3 per day

5,451

0,1835

pound-force

newton

4,448

0,2248

kilopond (Kp)

newton (N)

9,81

0,102

Roman Numerals

Basic numerals: I V X L C D M

1 5 10 50 100 500 1000

Combination rules:

— A smaller numeral in front of a larger is subtracted from the larger

— A smaller numeral after a larger is added to the larger

— Equal numerals after each other are added together

— II and III are never placed in front of a larger numeral, e. g. 7 is always VII, never IIIX

Examples:

5+1+1+1

VIII

1961 =

1000

+ 900 +

60

-100*1000

50+10

M

CM

LX

1000

+ 800 +

30

500+100+100+100

10+10+10

M

DCCC

XXX

MDCCCXXXVIII

A horizontal line above a numeral multiplies this numeral with 1000. A horizontal line above together with a vertical line on each side of the numeral multiplies the numeral with 100.000.

"ХІЇ = 12 ООО Я =1200 000