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Yr9 physics > Heat transfer > Flashcards

Heat transfer Flashcards

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1
Q

What is heat an example of?

A

Energy

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2
Q

What unit is heat energy measured in

A

Joule

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3
Q

How does heat travel

A

Heat travels from hot to cold area

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4
Q

What is temperature

A

A measure of how hot material is

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5
Q

How do you measure temperature

A

Use a thermometer

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6
Q

What temperature does water freeze at

A

0oC

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7
Q

What temperature does water boil at

A

100 oC

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8
Q

What is room temperature

A

20oC

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9
Q

What is body temperature

A

37.5oC

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10
Q

What are the 3 ways heat can be transferred

A

Conduction
Convection
Radiation

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11
Q

What is a good conductor of heat

A

Solid’s especially metals

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12
Q

Why are metals good conductors of heat

A

Metals have free electrons which can move through the solid and transfer the heat energy along the metal from hot to cold area

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13
Q

What is a poor conductor of heat

A

Non metals
Air

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14
Q

What is convection

A

Heat transfer in gases and liquids

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15
Q

Describe what happens during convection

A

The particles in gas/liquid gain heat energy and move further apart
They become less dense and rise
The colder more dense particles then fall down to replace those that rose up

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16
Q

How does heat radiation travel

A

Radiation does not need particles to travel
It travels through a vacuum
It is an electromagnetic wave

17
Q

What type of surface is a good emitter of heat radiation

A

Matt black surface

18
Q

What is a good absorber of radiation

A

Matt black surface

19
Q

How would you describe white surfaces in relation to heat radiation

A

White surfaces are good reflectors of heat radiation, poor absorbers and poor emitters of heat radiation

20
Q

What colour absorbs heat and emits heat

A

Black

21
Q

What colour reflects heat and is a poor emitter and absorber

A

White

22
Q

What is conduction

A

The atoms in a solid vibrate and as they gain energy, particles vibrate more and transfer heat along the solid from hot to cold area

Yr9 physics (4 decks)

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