1. Measurements and Calculations
Units of Measurement

2. Units of Measurement All Measurements contain: a quantity a unit
Le Systeme International d’Unites (SI)
adopted in 1960
consists of base units and derived units

5. What is the difference between mass and weight?

6. Derived units – combinations of one or more base units
Area (A)
Square meter m2
Length x width
Density (D)
Kg/m3
_mass_
volume
Molar Mass
Kg/mol
_Mass_
amount
Force
Kg*m s2
Mass x acceleration

7. Measuring Volume What is the SI unit for volume? 1 m x 1m x 1m = 1 m3
Some more convenient units:
1 Liter = 1000 cm3
Because 1000 mL = 1 L …
…1 mL = 1 cm3

8. Density What is the SI unit for Density? D = kg/m3
Some more convenient units:
g/cm3, g/mL