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3-2 Heating things up (3.1)
Heating things up (3.1)
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Slide 1:
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Natuurkunde
Middelbare school
havo, vwo
Leerjaar 2
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Heating things up (3.1)
Slide 1 - Diapositive
Heat food up
The bottom of the metal pan transfers heat to food.
The bottom of the pan is made of a metal wich conducts heat well.
Handle conducts heat poorly. e.g. wood
Slide 2 - Diapositive
Insulator
Wool and polystyrene foam insulate well, because they contain stationary air.
To keep a hot drink hot: Vacume is the poorest conductor of heat possible. e.g. doube-walled cup
Slide 3 - Diapositive
Convection of heat
In a fan oven air is blown through the over and transfers heat to the oven dish.
Slide 4 - Diapositive
Heating in a house
AIr circulation transports heat through the whole room.
A pump causes water to flow through the radiators.
Slide 5 - Diapositive
Radiation of heat
Grill of an oven transfers heat by radiation.
A fireplace is also a good example - facing the fireplace, you back gets cold.
The sun also radiates heat.
Slide 6 - Diapositive
The gulf stream
Due to the heat in Mexico - Amsterdam is hotter.
For climate these gulf streams are very important.
Slide 7 - Diapositive
Absorption and refelction:
- Black absorbs the best.
- Shiny objects absorbs poorly, and reflects thermal radiation. White reflects.
- The fire service use heat deflecting suits (layer of alluminium).
Slide 8 - Diapositive
In sunny countries are also mostly white houses.
Slide 9 - Diapositive
Why are radiators close to the ground?
A
For circulation
B
That the radiation is closer to people
C
That cats can lie on top of them
D
To hang towels on them to dry
Slide 10 - Quiz
Which movie is based on the change in temperature due to gulf streams?
A
The core
B
The day after tomorrow
C
2020
D
Tornado
Slide 11 - Quiz
Metals are good conductors of heat?
A
True
B
False
Slide 12 - Quiz
With thermal convection only the heat moves: the air stays in the same place.
A
True
B
False
Slide 13 - Quiz
With thermal conduction, only the heat moves: the metal particles stay in place.
A
True
B
False
Slide 14 - Quiz
Only radiation can transport heat without the presence of any matter in between to transport heat.
A
True
B
False
Slide 15 - Quiz
Cold air flows downwards.
A
True
B
False
Slide 16 - Quiz
In a saucepan the heat moves from the outside to the inside of the pan.
A
Radiation
B
Convection
C
Conduction
Slide 17 - Quiz
The sun heats the earth
A
Radiation
B
Convection
C
Conduction
Slide 18 - Quiz
In a stove-top kettle the heat moves from the bottom to the top.
A
Radiation
B
Convection
C
Conduction
Slide 19 - Quiz
An ice cube melts in your hand.
A
Radiation
B
Convection
C
Conduction
Slide 20 - Quiz
Heat is transported from the central heating boiler to the radiators.
A
Radiation
B
Convection
C
Conduction
Slide 21 - Quiz
Which phase best enables thermal convection to take place?
A
solid
B
liquid
C
gas
Slide 22 - Quiz
In which phase is conduction the only means of heat transfer, as convection cannot take place?
A
solid
B
liquid
C
gas
Slide 23 - Quiz
Questions
10 up to 16
When you are done read more about igloos on the internet
:-)
Slide 24 - Diapositive
Slide 25 - Diapositive
Slide 26 - Diapositive
Slide 27 - Diapositive
What have you
learned today?
Slide 28 - Carte mentale
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