Unit designations, prefixes, constants, and conversion factors

A

Ampere

Å

Angstrom

atm

Atmosphere

C

Coulomb

cal

Calorie

Ci

Curie

cm

Centimeter

cpm

Counts per minute

dm

Decimeter

dpm

Disintegrations per minute

g

Gram

h

Hour

J

Joule

kcal

Kilocalorie

kJ

Kilojoule

K

Kelvin

K

Equilibrium Constant

l

Liter

ln

Natural logarithm (base e)

lg

Common logarithm (base 10)

µm

Micrometer

µmol

Micromole

M

Molar concentration

m

Molal concentration

m

Meter

mg

Milligram

min

Minute

ml

Milliliter

mm

Millimeter

mmHg

Millimeters of mercury

mV

Millivolt

N

Normality

nm

Nanometer

pH

-lg[H⁺]

pK

-lgK'

rev

Revolution

s

Second

S

Svedberg

V

Volt

Factor

Prefix

Symbol

10⁶

mega

M

10³

kilo

k

10^-1

deci

d

10^-2

centi

c

10^-3

milli

m

10^-6

micro

µ

10^-9

nano

n

10^-12

pico

p

Avogadro number (N)

6.02∙10²³ molecules

Curie (Ci)

3.70∙10¹⁰ disintegrations/s

Atomic mass unit (Dalton)

1.661∙10^-24 g

Faraday constant (F)

23,062 cal/(V∙mol)

1.987 cal/(mol∙K)

96,485 C/mol

Universal

8.314 J/(mol∙K)

gas constant

1.584∙10^-34 cal∙s

(R)

Planck

constant (h)

6.626∙10^-34 J∙s

π = 3.1416

e = 2.718

ln (log_e)x = 2.303 lgx

Length

1 cm = 10 mm = 10⁴ µm = 10⁷ nm = 10⁸ Å = 0.394 in; 1 in = 2.54 cm

Mass

1 g = 10^-3 kg = 10³ mg = 10⁶ µg = 3.53 ∙ 10^-2 oz; 1 oz = 28.3 g

Temperature

°C = 5/9 (°F - 32); K = °C + 273

Energy

1 J = 10⁷ erg = 0.239 cal; 1 cal = 4.184 J

Pressure

1 torr = 1 mmHg = 1.32 ∙ 10^-3 atm;

1 atm = 760 torr