1. Heat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

2. 1
What is heat?
answer
A form of energy.

3. A scale used to measure heat energy (how hot or cold something is).2
What is temperature
answer
A scale used to measure heat energy (how hot or cold something is).

4. The unit is Degrees Celcius (oC)3
What would you use to measure how hot or cold something is? What is the unit of measurement?
answer
A thermometer
The unit is Degrees Celcius (oC)

5. 4
Complete the table to show the type of heat transfer for each physical state?
answer
Physical State
Method of Heat Transfer
Solid
Liquid
Gas
Conduction
Convection

6. What type of heat transfer is being described?5
What type of heat transfer is being described?
answer 5 4 3 2 1
Conduction
The end particle (1) gets hot, vibrates and passes some of its heat to the next particle (2)
This particle (2) becomes hot, vibrates and passes some of its heat to the next particle (3)
This process is carried along the line of particles

7. What type of heat transfer is shown here?6
What type of heat transfer is shown here?
answer
Convection (of liquids)

8. 7
Why does smoke from the wooden taper get drawn into the box and then out of the chimney?
answer
Convection
(of gases)

9. where hot particles rise and cold particles fall.8
What is convection?
answer
A type of heat transfer
where hot particles rise
and cold particles fall.

10. 9
What do you call a material that allows heat to pass through it easily?
answer
Conductor

11. 10
What do you call a material that DOES NOT allow heat to pass through it easily?
answer
Insulator

12. How is heat transfer used to boil water in this kettle?11
answer
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)

13. Who will get hot first? 12
answer
Ouch!!
Metal
Wood
The metal is the best conductor of heat. The wood and polystyrene are good insulators
Polystyrene
Heater

14. How does double glazing cut down on heat loss?13
How does double glazing cut down on heat loss?
answer
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.

15. How does a quilt stop you getting cold at night?14
How does a quilt stop you getting cold at night?
answer
Air is trapped between the layers of material. This cuts down on heat loss through conduction through solids

16. How does heat get transferred through space?15
answer
Radiation

17. The black one, because black is the best radiator of heat.16
Which of the three covered flasks of hot water will cool down quickest? Why?
answer
The black one, because black is the best radiator of heat.
Shiny Silver
Fur
Dull Black

18. The dull, dark surface heats up quicker, it is a good absorber of heat17
Two test tubes have 10ml of water and the same starting temperature. Which test tube will show the greatest temperature increase
answer
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
Light Bulb
Silver
coating
Black
coating

19. 18
Two test tubes are filled with 10ml of boiling water. Which test tube will show the greatest temperature decrease
answer
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
Silver
coating
Black
coating

20. What type of heat transfer do these images show?19
What type of heat transfer do these images show?
answer
Infra-red radiation

21. How can we cut down on heat loss in the home?20
How can we cut down on heat loss in the home?
answer
Loft insulation
Cavity Wall insulation
Double glazing
Draught excluders
Shut curtains

22. Why is polystyrene a good heat insulator?21
Why is polystyrene a good heat insulator?
answer
Air is trapped in the bubbles of plastic. This cuts down on heat loss through conduction through solids