Some Non-SI Units†

Appendix 3 Some Non-SI Units* Symbol for unit

Physical quantity

Name of unit

Length Time

angstrom minute hour day erg kilowatt hour thermochemical calorie dyne bar atmosphere conventional millimetre of mercury tonmaxwell gauss

Energy

Force Pressure

Magnetic flux Magnetic flux density (magnetic induction) Dynamic viscosity Concentration Radioactivity Radioactive exposure Absorbed dose Angle

Β min h d erg kWh calth dyn bar atm mmHg Torr Mx G, Gs

poise

Ρ M Ci R rad

curie rτntgen rad degree

°

Definition of unit , 0

1 0 - m (100pm) 60s 3600 s 86400 s 10~ J 3.6 χ 1 0 J 4.184J 10" N 10 Pa 101 325 Pa 13.5951 χ 9 . 8 0 6 6 5 P a i.e. 133.322 Pa (101 325/760) Pa 10" Wb 7

6

5

5

8

1

0

- 4

T

1

HT Pas mol d m 3.7 χ Ξ O ^ 2.58 χ l O ^ C k g " ΙΟ" Jkg" 1° = (ττ/180) radian - 3

1

1

1

2

1

^ T h e unit " d e g r e e C e l s i u s " ( ° C ) i s i d e n t i c a l w i t h t h e k e l v i n ( Κ ) . T h e C e l s i u s t e m p e r a t u r e ( i c ) i s r e l a t e d t o t h e t h e r m o d y n a m i c t e m p e r a t u r e Τ b y t h e d e f i n i t i o n : tc = Τ — 2 7 3 . 1 5 Κ.

Some useful conversion factors: 1 1 1 1 1

m = 3 . 2 8 0 8 3 9 9 ft = 3 9 . 3 7 0 0 7 9 i n c h e s inch = 2 5 . 4 m m (defined) statute m i l e = 1 . 6 0 9 3 4 4 k m light year = 9 . 4 6 0 5 5 χ 1 0 km acre = 4 0 4 6 . 8 5 6 4 m

1 1 1 1 1 1 1 1 1

gal (Imperial) = 1 . 2 0 0 9 4 9 gal ( U S ) = 4 . 5 4 5 9 6 0 1 g a l ( U S ) = 0 . 8 3 2 6 7 4 7 gal ( I m p . ) = 3 . 7 8 5 4 1 1 8 1 lb (avoirdupois) = 0 . 4 5 3 5 9 2 3 7 k g o z (avoirdupois) = 2 8 . 3 4 9 527 g o z ( t r o y , or a p o t h . ) = 3 1 . 1 0 3 4 8 6 g carat = 3 . 0 8 6 4 7 g r a i n s = 2 0 0 m g t o n n e = 1 0 0 0 k g = 2 2 0 4 . 6 2 2 6 1 b = 1 . 1 0 2 3 1 1 3 short t o n s short t o n = 9 0 7 . 1 8 4 7 4 k g = 2 0 0 0 1 b = 0 . 8 9 2 8 5 7 14 l o n g t o n s l o n g t o n = 1 0 1 6 . 0 4 6 9 k g = 2 2 4 0 1 b = 1 . 1 2 0 short t o n s

1 2

2

1 a t m = 101 3 2 5 P a = 1 . 0 1 3 2 5 bar = 7 6 0 Torr = 1 4 . 6 9 5 9 5 l b / i n 1 P a = 10~ 1 mdyn A"

1

5

bar =

1

1.019716 χ 1 0 " kg m "

lOONm"

2

= 0.986923 χ

2

5

10~ atm

1

1 calorie (thermochem) = 4 . 1 8 4 J (defined) 1 e V =

1.60219 χ

10"

1 9

J

1 e V / m o l e c u l e = 9 6 . 4 8 4 5 6 kJ m o l "

1

= 2 3 . 0 6 0 3 6 kcal m o l

- 1

1293