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.
Pages to are hidden for
"Expansion and Contraction - PowerPoint"Please download to view full document