# Expansion and Contraction - PowerPoint by pty56082

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```									Expansion and
Contraction
Expansion and Contraction of
Matter in General
Expansion                 Contraction
 As the average energy    As the average energy

(temperature) of          (temperature) of
particles increase,       particles decrease,
the space between the     the space between the
particles increase.       particles decrease.
Matter in the solid       Matter in the solid
liquid and gas phase      liquid and gas phase
EXPANDS!                  CONTRACTS!
Expansion and Contraction in
Solids
   Solids can EXPAND or CONTRACT
depending on the temperature
(average energy of the particles).

   For Example
• Metal Loop and Ball Demonstration
 Does the ball fit in the loop when the loop
and ball are cool?
 Will the ball fit in the loop when the loop is

heated? Why or Why Not?
Expansion and Contraction in
Liquids
   Liquids can EXPAND or CONTRACT
depending on the temperature (average
energy of the particles).

   This is demonstrated by the liquid used in a
thermometer. As the liquid expands and
contracts, it moves up and down the inside
tubing ( the bore ) of the thermometer.
Expansion and Contraction in
Gases
 Gasses can EXPAND or CONTRACT depending on
the temperature (average energy of the
particles). (
 What does Charles Gas Law say?

(see book page 36)

   Under extremely high temperature conditions
(like the temperatures inside the Sun, particles
can be split into what makes them up (electrons
and quarks etc). This creates a fourth state of
matter called plasma.
What do the particles of Matter
do When Heated?
   Particles
Steel Bridges
   Have expansion joints.
Bridge Expansion Joint Example
   Bridge Tour
   Have gaps at each joint.
   Have expansion joints built in.
Sidewalks
 Sidewalks are built with expansion
joints to try and avoid the cracking
that may occur.
 Sometimes a sidewalk will develop a

crack even with expansion joints. Do
you know what happens to the size
of the cracks in the winter and
summer?
Sidewalks
Cars
   Cars have engines with many
working parts. The parts are
engineered to be a little loose when
cold so that when the engine
becomes warm the parts do not
expand to be to tight.
Expansion/Contraction OOPS
 http://www.spirit-
lake.k12.ia.us/~jbolluyt/new/physics
/matter.html