DENSITY

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.

• VOLUMEMASSDENSITY

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)

VOLUME

• The amount of space an object takes up• Measured in 3 ways:1. REGULAR SOLIDS

- Length x width x height (ruler) - in cm3

2. LIQUIDS- use a graduated cylinder or beaker – in mL

VOLUME

3. IRREGULAR SOLIDSDisplacement (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

Eureka!

• YouTube: • http://www.youtube.com/watch?

v=GMNpPgLT8Fk

CONVERSIONS

Mass:•1000 g = 1 kgVolume:•1000 mL = 1 L•1000000 cm3 = 1 m3

• 100 cm = 1 m• 100 x 100 cm = 1 m2

• 100 x 100 x 100 cm = 1 m3