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123456789 101112131415161718 1920212223 2425 1 What is heat? answer A form of energy.
Dec 28, 2015
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1What is heat?What is heat?
answer
•A form of energy.
A scale used to measure heat energy (how hot or cold something is).
answer
2
What is temperatureWhat is temperature
What would you use to What would you use to measure how hot or cold measure how hot or cold
something is?something is?What is the unit of What is the unit of
measurement?measurement?
A thermometer
The unit is Degrees Celcius (oC)
answer
3
Physical State Method of Heat Transfer
Solid
Liquid
Gas
Complete the table to Complete the table to show the type of heat show the type of heat
transfer for each transfer for each physical state? physical state?
Conduction
Convection
Convection
answer
4
What type of heat What type of heat transfer is being transfer is being
described? described?
Conduction
answer
5
The end particle (1) gets hot, vibrates and passes The end particle (1) gets hot, vibrates and passes some of its heat to the next particle (2)some of its heat to the next particle (2)
This particle (2) becomes hot, vibrates and This particle (2) becomes hot, vibrates and passes some of its heat to the next particle (3)passes some of its heat to the next particle (3)
This process is carried along the line of particlesThis process is carried along the line of particles
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What type of heat What type of heat transfer is shown transfer is shown
here? here?
answer
6
Convection (of liquids)
Why does smoke from the Why does smoke from the wooden taper get drawn into wooden taper get drawn into the box and then out of the the box and then out of the chimney?chimney?
Convection
(of gases)
answer
7
What is convection?What is convection?
answer
8
A type of heat transfer where hot particles rise and cold particles fall.
What do you call a What do you call a material that allows material that allows heat to pass through heat to pass through
it easily?it easily?
Conductor
answer
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10
answer
Insulator
What do you call a What do you call a material that DOES NOT material that DOES NOT allow heat to pass allow heat to pass through it easily?through it easily?
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answerThe copper will
melt the wax
first because it
is the best
conductor of
heat
Which type of metal will Which type of metal will melt the wax first? Why?melt the wax first? Why?
Copper
Bra
ss
Mild
steel
Sta
inle
ss steel
Hot
Water
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answer
How is heat transfer How is heat transfer used to boil water in this used to boil water in this kettle?kettle?
•CONVECTION(The element heats the water at the bottom.
The hot water is less dense and rises up
The cold water is more dense and falls down to the bottom and meets the element
This goes on in a cycle until the water is boiling)
Metal Wood Polystyrene
Heater
answer13 Who will get hot first?Who will get hot first?Ouch!!
The metal is the best The metal is the best conductor of heat. The conductor of heat. The wood and polystyrene wood and polystyrene
are good insulatorsare good insulators
How does double How does double glazing cut down on glazing cut down on
heat loss?heat loss?The air gap is too small to allow the air to circulate.This prevents heat loss by convection
The trapped air is a very poor conductor which reduces heat loss through the window.
answer
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How does a quilt stop How does a quilt stop you getting cold at you getting cold at
night?night?
Air is trapped between the layers of material. This cuts down on heat
loss through conduction through
solids
answer
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How does heat get How does heat get transferred through transferred through
space?space?
Radiation
answer
16
In straight lines
answer
17 What direction does radiation travel in?
Which of the three covered flasks Which of the three covered flasks of hot water will cool down of hot water will cool down quickest? Why?quickest? Why?
answer
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Shiny Silver Fur Dull Black
The black one, because black is The black one, because black is the best radiator of heat.the best radiator of heat.
Two test tubes have 10ml of water and Two test tubes have 10ml of water and the same starting temperature. Which the same starting temperature. Which test tube will show the greatest test tube will show the greatest temperature increasetemperature increase
The dull, dark surface heats up quicker, it is a good absorber of heat
The shiny silver surface heats up slowly, it is a poor absorber of heat
answer
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Light BulbSilver
coating
Black
coating
Two test tubes are filled with 10ml of Two test tubes are filled with 10ml of boiling water. Which test tube will boiling water. Which test tube will show the greatest temperature show the greatest temperature decreasedecrease
The dull, dark surface cools down quicker, it is a good radiator of heat
The light, shiny surface cools down slowly, it is a poor radiator of heat
answer
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Silver
coating
Black
coating
What type of heat What type of heat transfer do these transfer do these
images show?images show?answer
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Infra-red radiationInfra-red radiation
What type of heat What type of heat transfer is an transfer is an
electromagnetic electromagnetic wave?wave?
Infra - red
answer
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When are hot objects When are hot objects losing heat energy?losing heat energy?
All the time!
answer
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How can we cut down on How can we cut down on heat loss in the home?heat loss in the home?
answer
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Loft insulationCavity Wall insulationDouble glazingDraught excludersShut curtains
Why is polystyrene a Why is polystyrene a good heat insulator?good heat insulator?
Air is trapped in the bubbles of plastic. This cuts down on heat loss
through conduction through solids
answer
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