Aim: How do we calculate density?
Do Now: Convert the following metric units
564 L = ____ mL
1.23 g = ____ cg
.02 KL = ____ mL
600 Hg = ____ dg
1.3 Dm = ____ Km
99 dm = ____ Dm
Homework: Study for metric quiz
Introduction to Density
What is density?
 Density
is a
specific property
of matter that is
related to the
mass divided by
the volume
What is the formula for density?

D = _Mass_
Volume

D=M
V

D = Density
M = Mass
V = Volume


M
D
V
Why does a penny sink in water?
 Pennies
are
more dense
than water,
therefore they
sink
Why does ice float in water?
 Ice
cubes are
less dense than
water, therefore
they float
How will an egg float in water?
 Egg
in fresh
water
–
The egg will
sink because it
is more dense
than the fresh
water
How will an egg float in water?
 Egg
in salt water
– The egg will
float because it
is less dense
than the salt
water
How will an egg float in water?
 Egg
in fresh and
salt water
–
The egg will be
suspended in the
middle because it
is the same
density as the
water mixture
Work on the Density Calculations
Check your answers
with your neighbor
How Do We Calculate Density in
3 Easy Steps?
 Step
1
– Calculate the
mass of your
object using the
triple-beam
balance
How Do We Calculate Density in
3 Easy Steps?
 Step
2
– Calculate the volume
Measure the length, width and
height and use the volume formula
Use the graduated cylinder for
liquids or irregular solids
How Do We Calculate Density in
3 Easy Steps?
 Step
3
– Use the density formula
D = _Mass_
Volume
Place these items in order of
density from least to greatest
E
C
E
C
A
D
B
A
D
B
Summary
1.
2.
3.
4.
5.
What is density?
Is Ice more or less dense than water? Why?
Name an item that is more dense than water.
Why does an egg float in salt water?
How can we calculate the density of common
items?