Notes
SPI 0807.9.7
Density
Science
Instructions
1) First click on Tennessee
"View" fromSPI
the Objective:
top-menu bar.
an on
equation
to determine
the densitymenu.
of an
2) Apply
Then click
"Slide Show"
from the drop-down
3) Then use
the right-arrow
on and
your volume
keyboard to
object
based on button
its mass
advance through this presentation.
Check for Understanding
Calculate the density of various objects.
Essential Question(s)
What is density? What is mass? What is volume?
How do I calculate density?
How do I multiply and divide with decimals?

Humor
 Silly Thought 20 
Never trust an atom.
They make up everything.

Notes
SPI 0807.9.7
Density
Science
What is density?
 Density is the amount of matter (mass)
you have crammed in a given space (volume)
Reminder: mass is how much matter is in an object
 The unit for mass is grams (mg or g or kg)
Reminder: volume is how much space it takes up (size)
 Unit for solid volume is cubic meters (cm3 or m3 or km3)
 Unit for liquid volume is liters (mL or L or kL)
To compute density
 - divide the mass by the volume of the object
Demonstration:
Demonstrate with wadded up paper in a trash can
SPI 0807.9.7
Density
Notes
Science
Density Example:
 Here are two objects that are the same size.
(1) Bowling Ball and (2) Soccer Ball
 One of these objects contains more matter (bowling ball).
 With two same-sized objects like this, the object with more
mass has greater density than the other object.
More Dense
Less Dense
0807.9.7
Solve The ThreeSPI
Density
Problems Shown Below
Quick
Science
Go
ahead
and
use
a
calculator
(for
now)
Density
Practice
Use this formula: Density=mass divided by volume
or D= M
Density= volume mass
D= M/V
or
V
1) …density of an object with a mass of 25g a volume of 10cm3?
Example: 25 (mass) divided by 10 (volume) Units…
Density= 10 25
g/cm3
2) …density of an object with a mass of 45kg a volume of 43m3?
Example: 45 (mass) divided by 43 (volume) Units…
Density= 43 45
kg/cm3
3) …density of an object with a mass of 350g a volume of 95cm3 ?
Example: 350 (mass) divided by 95 (volume) Units…
g/cm3
Density= 95 350
Notes
Don't
Forget
Your Units!
SPI
0807.9.7
Example: grams/centimeter cubed
Density
Written like this…g/cm3
Science
Density=mass divided by volume
Answers
1) …density of an object with a mass of 25g & volume of 10cm3?
25g ÷ 10cm3 = 2.5g/cm3
2) …density of an object with a mass of 45kg & volume of 43m3?
(round up to the nearest hundredth)
45kg ÷ 43m3 = 1.05kg/m3
3) …density of an object with a mass of 350g & volume of 95cm3 ?
(round up to the nearest hundredth)
350g ÷ 95cm3 = 3.68g/cm3
Notes
SPI 0807.9.7
Density
Science
What is density?
 Density is the amount of matter (mass)
you have crammed in a given space (volume)
Density can be…
Low, Moderate, or High
Low: Cotton Candy
Moderate: A brick
High: A diamond
 Demonstration 
Demonstration in restroom foyer….lets go!
Density
In Liquids
SPI 0807.9.7
Notes
Science
Lower
density liquids will float on top of liquids with higher
density
Density
Example: Oil floats on top of water
Designation
Substance
Density
Liquid 01
Water
1.0 g/mL
Liquid 02
Liquid Mercury
13.6 g/mL
Liquid 03
Turpentine
0.8 g/mL
1) Identify which liquids would occupy levels A, B, and C
according to their density.
SPI 0807.9.7 (Density)
ANSWERS
Level A Turpentine (0.8 g/mL)
Level B Water (1.0 g/mL)
Level C Mercury (13.6 g/mL)
Notes
SPI 0807.9.7
Density
Science
Density In Liquids
Lower density liquids float on top of liquids with higher density
Higher density liquids will sink below lower density liquids
View this YouTube Video Clip:
Link: 7-Layer Density Column
SPI if0807.9.7
Find the density
each of these objects
Notes
Science
Again…go ahead and
use
a
calculator
(for
now)
Density
(B)
(A)
Mass: 12g
Volume: 3cm3
Mass: 19g
Volume: 7cm3
4 g/cm3
2.71 g/cm3
(C)
(D)
Mass: 11g
Volume: 3cm3
Mass: 23g
Volume: 5cm3
3.6 g/cm3
4.6 g/cm3
Which cube above has the GREATEST density?
SPI if0807.9.7
Find the density
each of these objects
Notes
Science
Again…go ahead and
use
a
calculator
(for
now)
Density
(B)
(A)
Mass: 18g
Volume: 6cm3
Mass: 29g
Volume: 7cm3
3 g/cm3
4.14 g/cm3
(C)
(D)
Mass: 30g
Volume: 8cm3
Mass: 21g
Volume: 5cm3
3.75 g/cm3
5.25 g/cm3
Which cube above has the LEAST density?