SI Units: In 1960 an international

committee of scientists revised the metric system of

measurements... It is now called the:

“Système Internationale d’Unités.”

Metric Prefixesprefix symbol factor 10x

giga G 1,000,000,000 109

mega M 1,000,000 106

kilo k 1,000 103

deci d 0.1 10-1

centi c 0.01 10-2

milli m 0.001 10-3

prefix symbol factor 10x

micro μ 0.000001 10-6

nano n 0.000000001 10-9

pico p 0.000000000001 10-12

SI Base Units

Quantity Unit Symbol

time second s

length meter m

mass kilogram kg

temperature kelvin K

amount mole mol

Derived Units(a combination of base units)

Quantity Unit Symbol

speed meters/second m/s

volumecubic meter

orcubic centimeter

m3

cm3

density grams/cm3 g/cm3

Unit relationships youshould become familiar with:

1 inch = 2.54 cm

1 mile = 1.61 km

1 km = 1000 m = 0.62 miles

1 cm3 = 1 mL

1000 cm3 = 1000 mL = 1 liter (L)