International System of Units (SI)
 adopted in 1960
 seven base units which all others can be derived
 m, kg, K, s, mol, cd, A
Common Metric Prefixes
 Length
 a linear measurement
 meter (m)
 common units- cm, m, km
 Volume
 space occupied by a sample of matter
 cubic meter (m3) but we use the smaller, non-SI
unit liter (L) most of the time instead
 common units- L, ml, cm3, µL
 should be measured at 0°C
 Mass
 measures the
quantity of matter
 kilogram (kg)
 common units- kg,
g, mg, µg
 Temperature
 measures kinetic energy of particles
 kelvin (K)
 common units- K and °C
Density
 an intensive property
 the ratio of an object’s mass
to its volume
 depends only on the
substance, NOT ON THE
SIZE of the substance
 as temperature increases,
density normally decreases
(thermal expansion)
Density
D = M/V
D = density
M = mass
V = volume
Example problem
• A piece of lead has a mass of 56.4 g and a
volume of 5 cm3. Calculate its density.
given
M= 56.4 g
V= 5 cm3
formula
D=M/V
set up problem
56.4g/5 cm3
answer w/ unit of measurement
10 g/ cm3
cm3 is same as ml so sometimes see g/ml