1. DENSITY

2. DENSITY The amount of mass per unit of volume
Items with low density: feathers, marshmallows, pillows, etc.
Items with high density: rock, most metals, etc.

3. Mass The amount of matter in an object
Units are grams (g) or kilograms (kg)
Measured with a digital scale
NOT WEIGHT! (that’s the mass compared to gravity)

4. VOLUME The amount of space an object takes up Measured in 3 ways:
REGULAR SOLIDS
- Length x width x height (ruler) - in cm3
LIQUIDS
- use a graduated cylinder or beaker – in mL

5. VOLUME IRREGULAR SOLIDS Displacement
- add object to a known volume of water
- the amount the water rises is the volume of the object
- since density of water is 1, use grams because the object is a solid

6. CONVERSIONS 1000 mL = 1 L 1000 g = 1 kg 1000000 cm3 = 1 m3
100 x 100 cm = 1 m2
100 x 100 x 100 cm = 1 m3