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SI Units, Conversions, and Multiples

Source:
A Dictionary of Geology and Earth Sciences

SI Units, Conversions, and Multiples

SI Units (Système International d'Unités)

Quantity

Name of unit

Symbol

Equivalent

Reciprocal

length

metre

m

3.281 feet

1 ft = 0.3048 m

mass

kilogram

kg

2.2 pounds

1 lb = 0.454 kg

time

second

s

electric current

ampere

A

thermodynamic temperature

kelvin

K

1 °C (1.8 °F)

1 °C = 1 K

luminous intensity

candela

cd

amount of substance

mole

mol

Supplementary Units

Quantity

Unit

Symbol

plane angle

radian

rad

solid angle

steradian

sr

Derived SI units

Quantity

Name of unit

Symbol

Equivalent

Reciprocal

frequency

hertz

Hz

energy

joule

J

0.2388 calories

1 cal = 4.1868 J

force

newton

N

0.225 pounds force

1 lbf = 4.448 N

power

watt

W

0.00134 horse-power

1 hp = 745.7 W

pressure

pascal

Pa

0.00689 lbf/in2

1 lbf/in2 = 145 Pa

electric charge

coulomb

C

electric potential difference

volt

V

electric resistance

ohm

ø

electric conductance

siemens

S

electric capacitance

farad

F

magnetic flux

weber

Wb

inductance

henry

H

magnetic flux density

tesla

T

luminous flux

lumen

lm

illuminance

lux

lx

absorbed dose

gray

Gy

activity

becquerel

Bq

dose equivalent

sievert

Sv

Multiples used with SI units

Name of multiple

Symbol

Value (multiply by)

atto

a

10-18

femto

f

10-15

pico

p

10-12

nano

n

10-9

micro

μÌ

10-6

milli

m

10-3

centi

c

10-2

deci

d

10-1

deca

da

10

hecto

h

102

kilo

k

103

mega

M

106

giga

G

109

tera

T

1012

peta

P

1015

exa

E

1018