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Effects of heat 6 fsc e learning day 4
- 1. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
- 2. Expansion and contraction • What will happen when solids gain or lose heat? o After the ball gains heat, it became bigger and cannot pass through the ring. o The increase in size is because of heat gain and is called expansion. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
- 3. Expansion and contraction • What will happen when solids gain or lose heat? o After the ball has cooled down and lost heat, it becomes smaller. o It can now pass through the ring. o The decrease in size is because of heat loss and is called contraction. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
- 4. Expansion and contraction • What will happen when liquids gain or lose heat? o When the flask is placed in a basin of hot water, the water level will rise up the glass tube. o This shows that the water in the flask has gained heat and expanded. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited water level after expansion original water level
- 5. Expansion and contraction • What will happen when liquids gain or lose heat? o When the flask is placed in a basin of ice water, the water level in the glass tube will fall. o This shows that the water in the flask has lost heat and contracted. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited water level after contraction original water level
- 6. Expansion and contraction • What will happen when gases gain or lose heat? o When the boiling tube is placed in a basin of hot water, the air in the boiling tube gains heat. o The air expands and pushes against the red ink. o The red ink level moves up the glass tube. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited original red ink level red ink level after expansion of air
- 7. Expansion and contraction • What will happen when gases gain or lose heat? o When the boiling tube is placed in a basin of ice water, the air in the boiling tube loses heat. o The air contracts. o As a result, the red ink level moves down the glass tube. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited original red ink level red ink level after contraction of air
- 8. Expansion and contraction What have you learnt from the experiments? Gases, liquids and solids expand when they are heated and contract when they are cooled. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
- 9. Expansion and contraction in our daily lives • When it gets hot, concrete slabs on the pavement expand. • The gaps in-between the concrete slabs allow space for expansion. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
- 10. Expansion and contraction in our daily lives • The gaps in-between the bridge allow space for expansion. My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private LimitedMy Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
- 11. Expansion of a gas https://www.youtube.com/watch? v=ZPErStqSSMk Expansion on a railway track https://www.youtube.com/watch? v=RZ-sYY_vZC4