2. Why did the liquids settle in a specific order?
Why did some object float while some sunk.
Whycan some heavier objects float while
some lighter objects sink?
3. Density…
Is a property of all
matter: solids, liquids
and gases.
Is found by dividing an
object’s mass by its
volume.
Units for mass: _____
Units for volume: _____
4. Density…
Measures how tightly
matter is packed within
an object
Symbol = rho (ρ)
6. Examples
A block with a volume Mass = 52.5 g
of 15 cubic centimeters
has a mass of 52.5 Volume = 15 cm3
grams. What is its
density?
Divide!
Mass
------------
Density = 3.5 g/cm3
Volume
7. Examples
A die (1.0 cm on each Mass = 3.6 g
side) has a mass of 3.6
g. What is its density? Volume = 1.0 cm3
Mass Divide!
------------
Volume Density = 3.6 g/cm3
8. Examples
Youhave a piece of metal with a volume of
245 cm3 and a mass of 612 g. Is it aluminum
(which has a density of 2.70 g/cm3)?
A 14.0 cm3 ice cube has a density of 12.83 g.
What is the density? Compare this to the
density of water. What does this tell you
about the ice?
9. Examples
A jar has a volume of Oxygen: 0.00133 g/cm3
953 cm3. If a scientist
measures the mass of Nitrogen: 0.00117 g/cm3
the gas in the jar at
0.158 g, what gas is
probably in the jar? Helium: 0.00016 g/cm3
0.000166 g/cm3 Hydrogen: 0.00008
g
/cm3
10. Examples
A jar has a volume of Oxygen: 0.00133 g/cm3
953 cm3. If a scientist
measures the mass of Nitrogen: 0.00117 g/cm3
the gas in the jar at
0.158 g, what gas is
probably in the jar? Helium: 0.00016 g/cm3
0.000166 g/cm3 Hydrogen: 0.00008
g
/cm3