SI Units and Measurement Standards

meter

length

kilogram

mass

second

time

Ampere

electric current

kelvin

temperature

mole

the amount of substance

candela

the intensity of light

standard

is an exact quantity that people agree to use to compare measurements.

tera- T

1,000,000,000,000, or 10¹²

giga- G

1,000,000,000, or 10⁹

mega- M

1,000,000, or 10⁶

kilo- k

1,000 or 10³

deci- d

one-tenth or 10^-1

centi- c

0.01 or 10^-2

milli- m

0.001 or 10^-3

micro- µ

0.000001, 1/1,000,000, or 10⁻⁶

nano- n

0.000000001, 1/1,000,000,000, or, 10⁻⁹

pico- p

1/1,000,000,000,000, or 10⁻¹²

Length

is the distance between two points.

Volume

the amount of space occupied by an object.

Mass

is a measurement of the quantity of matter in an object.

Density

is the mass per unit volume of the material the object is made of.

derived unit

is a unit obtained by combining different SI units.

time

is the interval between two events.