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# Expansion solid

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### Transcript

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