1. DENSITY

2. 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 Metric units are grams (g) or kilograms (kg) Measured with a digital scale NOT WEIGHT! (that’s mass compared to gravity)

4. VOLUME The amount of space an object takes up Measured in 3 ways: 1.REGULAR SOLIDS - Length x width x height (ruler) - in cm 3 2.LIQUIDS - use a graduated cylinder or beaker – in mL

5. VOLUME 3.IRREGULAR SOLIDS Displacement (Archimedes Principle) - 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. Eureka! YouTube: http://www.youtube.com/watch?v=GMNpPgLT 8Fk http://www.youtube.com/watch?v=GMNpPgLT 8Fk

7. CONVERSIONS Mass: 1000 g = 1 kg Volume: 1000 mL = 1 L 1000000 cm 3 = 1 m 3 100 cm = 1 m 100 x 100 cm = 1 m 2 100 x 100 x 100 cm = 1 m 3