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
            Railroad Tracks
   Have gaps at each joint.
Railroad Rails
            Concrete roads
   Have expansion joints built in.
Concrete Roads
Concrete Roads
             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
 http://www.youtube.com/watch?v=H

  xTZ446tbzE&feature=related
  (Bridge)
                   Quiz!
   Please pick up a clicker and get
    ready for the quiz.

								
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