Density
Archimedes
Archimedes and the Golden Crown
Density
• Density is how
compact matter is.
• More mass shoved
into a certain amount
of space makes
something more
dense.
Density Considers Two Things
• How much mass is present.
• How much volume does it take up.
• Make sure to consider both these factors
when discussing density.
A
A
1.What does Figure A
illustrate about the
density of the two
metals? Explain.
A
A
A
A
2. What does Figure B
illustrate about the
density of the two
metals? Explain.
A
A
3. If the cube of
aluminum in figure B
were cut into four
equal parts. How
would the density of
one part compare to
the whole cube?
A
A
4. Metals expand when
heated. If the gold
cube in part B is
heated, what will
happen to its density?
Does it Float?
• If something floats or
rises it is less dense
than the material it is
floating/rising in.
• Objects of greater
density will sink.
Density
• Density is the mass per unit volume.
– How much mass there is in a certain amount
of space.
Density
• Density is the mass per unit volume.
• Density = Mass ÷ Volume
Density
• Density is the mass per unit volume.
• D = Mass ÷ Volume
÷
Solving For Variables
Common Volume Units
Mass = 2680g
Volume = 1450cm3
Illegal ivory is often detected on the basis of
density. What is the density of the elephant tusk?
Mass = 2680g
Volume = 1450cm3
D=M÷V
= 2680g ÷ 1450cm3
= 1.8482g/cm3
= 1.85g/cm3
Illegal ivory is often
detected on the basis
of density. What is
the density of the
elephant tusk?
Calcium chloride
is used as a
deicer on roads
in winter. Its
density is
2.50g/cm3.
What mass of
calcium chloride
will the truck
hold if its volume
is 4560L?
Calcium chloride is used
as a deicer on roads in
winter. Its density is
2.50g/cm3. What mass
of calcium chloride will
the truck hold if its
volume is 4560L?
4560L = 4,560,000cm3
Calcium chloride is used as
a deicer on roads in winter.
Its density is 2.50g/cm3.
What mass of calcium
chloride will the truck hold if
its volume is 4560L?
4560L = 4,560,000cm3
M=DxV
= 2.50g/cm3 x 4,560,000cm3
= 11,400,000g
= 11,400,000g
The density of methanol is 0.788g/cm3. What is the
minimum volume of a tank that can hold 795kg of methanol.
The density of methanol
is 0.788g/cm3. What is
the minimum volume of
a tank that can hold
795kg of methanol.
795kg = 795,000g
The density of methanol
is 0.788g/cm3. What is
the minimum volume of
a tank that can hold
795kg of methanol.
795kg = 795,000g
V=M÷D
= 795,000g ÷ 0.788g/cm3
= 1,008,883cm3
= 1,010,000cm3
How many liters is this?
The density of methanol
is 0.788g/cm3. What is
the minimum volume of
a tank that can hold
795kg of methanol.
1,010,000cm3 ÷ 1000 cm3/L = 1010L
Homework
• Worksheet: Chapter 2-3
• Study Guide Chapters 1 & 2 due Monday