Effects of heat 6 fsc e learning day 4
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My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
Transcript of Effects of heat 6 fsc e learning day 4
My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
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
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
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
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.
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water level after contraction
original water level
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
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.
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original red ink level
red ink level after contraction of air
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.
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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
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
Expansion of a gas https://www.youtube.com/watch?v=ZPErStqSSMk
Expansion on a railway trackhttps://
www.youtube.com/watch?v=RZ-sYY_vZC4
