Name
LESSON
Date
Outline
Density and Buoyancy
Use your textbook to help you fill in the blanks.
What is density?
1. The measurement of how much mass fits within a certain
volume is called
density
.
particles
2. Density describes how tightly the
that make up a substance are packed together.
less
3. Objects float if they are
dense than the
sink
substance in which they are placed. They
if they are denser than the substance in which they are placed.
4. Steel is denser than water. However, steel ships can float on
air
water because their hulls are filled with
mass
5. An object’s density is found by dividing its
by its
volume
.
.
What does density depend on?
masses
6. The density of a material depends on the
of the particles that make up the material and the
© McGraw-Hill Education
distances
between the particles.
7. The particles of a solid tend to be packed
gas
together. The particles of a(n)
to be spread out.
8. Usually, matter in the
tightly
tend
solid
state is denser
than in the liquid state. Matter in the liquid state tends to be
denser than in the gaseous state.
Unit 2 • Matter and Its Properties
Unit Resources
Use with Lesson 2
Density and Buoyancy
2-19
LESSON
Outline
Name
Date
same
9. The density of a substance is the
no
matter how much of the substance is present.
identify
10. Density can help
an unknown
substance.
11. Gold has a density of 8.92 g/cm3. If an unknown
substance has a density of 8.92 g/cm3, it would most
likely be
gold
.
What is buoyancy?
12. Materials that can flow, such as liquids and gases,
are called
fluids
13. Objects can float because of
.
buoyancy
.
14. Buoyancy occurs because the fluid that is being
pushed
out of the way pushes back
on the object.
15. According to
Archimedes’
principle, the
amount of buoyant force acting on an object is equal
to the weight of the fluid it displaces.
16. If the buoyant force is greater than the object’s weight,
the object will
float
.
17. Explain why density is a physical property of an object.
A physical property of a substance is one that can be observed
without changing the identity of the substance. When you describe
an object’s density, you describe how much mass is in a certain
volume. The substance is not changing into a new substance.
2-20
Unit 2 • Matter and Its Properties
Unit Resources
Use with Lesson 2
Density and Buoyancy
© McGraw-Hill Education
Critical Thinking