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# Expansion solid

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### Expansion solid

1. 1. Apperception <ul><li>Why is a space left between the railway line where one piece joins the next? </li></ul>
2. 2. Thermal Expansion Objective Investigating thermal expansion in solid
3. 3. Activity Using your Student Worksheet 11.6 (page 129) Do the experiment in your group
4. 4. Summary <ul><li>Solid expand when they are heated, and decrease in volume when they get colder. </li></ul><ul><li>From a microscopic point of view, the result of heating a material can be explained as follows: </li></ul><ul><ul><li>There is an addition of energy to the material </li></ul></ul><ul><ul><li>The internal energy of the atoms of the material increase, causing atoms to vibrate </li></ul></ul><ul><ul><li>The vibrating atoms now occupy more space when hot compared to when cold. </li></ul></ul>
5. 6. Thermal Expansion Expansion of solid Expansion of liquid Expansion of gas Linear expansion Area expansion Volume expansion  l= lo.  .  t  A= Ao.  .  t  V= Vo.  .  t
6. 7. Linear Expansion l o  l l t
7. 8. Linear Expansion <ul><li>The magnitude of the thermal expansion of the solid depend on : </li></ul><ul><ul><li>Type of solid </li></ul></ul><ul><ul><li>Temperature rise </li></ul></ul><ul><ul><li>Length </li></ul></ul>
8. 9. Linear Expansion <ul><li>The expansion of solid body is proportional to the temperature rise and to its length </li></ul><ul><li>We can make Formula </li></ul><ul><li> l  l o  t </li></ul>
9. 10. Summary <ul><li>Or We can write in equation of thermal expansion: </li></ul><ul><li> l =  l o  t </li></ul><ul><ul><ul><li> l = change in length (m) </li></ul></ul></ul><ul><ul><ul><li> = coefficient of thermal expansion ( o C 1 ) </li></ul></ul></ul><ul><ul><ul><li>l o = Initial length (m) </li></ul></ul></ul><ul><ul><ul><li> t = change in temperature ( o C) </li></ul></ul></ul>
10. 11. Summary <ul><li>On a hot day, the metal expands and if it were not allowed to do this, the rails would bend out of shape. </li></ul><ul><li>This has caused railway accident in the past. </li></ul>click
11. 12. Area Expansion A o  A A t
12. 13. Area Expansion <ul><li>We can make Formula </li></ul><ul><li> A  A o  t </li></ul>
13. 14. Summary <ul><li>Or We can write in equation of thermal expansion: </li></ul><ul><li> A =  A o  t </li></ul><ul><ul><ul><li> A = change in Area (m 2 ) </li></ul></ul></ul><ul><ul><ul><li> = coefficient of thermal expansion ( o C 1 ) </li></ul></ul></ul><ul><ul><ul><li>A o = Initial Area (m 2 ) </li></ul></ul></ul><ul><ul><ul><li> t = change in temperature ( o C) </li></ul></ul></ul>click
14. 15. Volume Expansion V o  V V t
15. 16. Volume Expansion <ul><li>We can make Formula </li></ul><ul><li> V  V o  t </li></ul>
16. 17. Summary <ul><li>Or We can write in equation of thermal expansion: </li></ul><ul><li> V =  V o  t </li></ul><ul><ul><ul><li> V = change in Volume (m 3 ) </li></ul></ul></ul><ul><ul><ul><li> = coefficient of thermal expansion ( o C 1 ) </li></ul></ul></ul><ul><ul><ul><li>V o = Initial Volume (m 3 ) </li></ul></ul></ul><ul><ul><ul><li> t = change in temperature ( o C) </li></ul></ul></ul>
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