what is density?. density is… the ratio of the mass of a substance to it’s volume

What is Density?What is Density?

Density is…Density is…

The ratio of the The ratio of the

MASS MASS

of a substance of a substance to it’s to it’s

VOLUMEVOLUME

Mass Is…Mass Is…

A measure of A measure of how much how much matter is in matter is in an objectan object

How is Mass Measured?How is Mass Measured?

Use a balanceMeasured in grams (g)

Volume is…Volume is…

The amount of The amount of space that space that matter matter occupies.occupies.

ll x x ww x x hh = = volumevolume

Volume is…Volume is…

Measured in the Measured in the metric unitmetric unit

cubic centimeter cubic centimeter

oror

centimeter cubedcentimeter cubed

or or

(cm(cm33))

1 cm3 = 1 ml

8 cm3 = 8 ml

15 ml = 15 cm3

VolumeVolume

A liquid is A liquid is measured using measured using a graduate a graduate

cylinder.cylinder.

Liquids are Liquids are measures in measures in

milliliters (ml)milliliters (ml)

The Formula for DensityThe Formula for Density

Density = Mass (g) / Volume (cmDensity = Mass (g) / Volume (cm33))

What else do I need to What else do I need to know?know?

Density of Water is Density of Water is 1 g / cm1 g / cm33

When does something Float?When does something Float?

When it’s density is less than 1 g/cmWhen it’s density is less than 1 g/cm33

When does something sink?When does something sink?

When it’s density is more than 1 g/cmWhen it’s density is more than 1 g/cm33

Measuring Density…Measuring Density…

Regular Regular shaped shaped objecrtsobjecrts

l x w x h = l x w x h = cmcm33

Measuring Density…Measuring Density…

IRREGULAR Shaped ObjectsIRREGULAR Shaped Objects““displacement Method”displacement Method”

1.1. Fill a graduate cylinder to a whole Fill a graduate cylinder to a whole ##

2.2. Carefully drop object into the Carefully drop object into the graduategraduate

3.3. Subtract the differenceSubtract the difference

cmcm33 = volume = volume