Density (note)

1.5 DENSITY

Why they float
easily??

Why they float easily??

Density of water in the Dead Sea is
extremely high and can make people

float easily

THE FORMULA OF DENSITY

density is mass per unit volume of the substance

Density =

M

Unit = g/cm3 or kg/m3

D MV

EXAMPLE:

A stone has a volume of 100 cm3 and its density is of 3 g/cm3. Find its mass.

M Mass = density x volume
D MV
Mass = 3 g/cm3 x 100 cm3
Mass = 300 cm3

Difference thing with the
same volume do not
have the same mass

so
The DENSITY will be

Different

HIGH density → SINK
LOW density → FLOAT

Egg is

less dense than

the water

Wood is

less dense than

the water

Candle is

less dense than

the water

Marble is

more dense than

the water

MATERIAL DENSITY (g/cm3)

Gold 19.30
Lead 11.30
Copper 8.92
Aluminium 2.70
Ice 0.92
Cork 0.24
Mercury 13.60
Seawater 1.03
Pure water 1.00
Petrol 0.80

Cork Petrol
Ice Pure water
Aluminium
Seawater Lead
Copper Gold
Mercury