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Physics > Heat Trasfer > Flashcards

Heat Trasfer Flashcards

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1
Q

What is heat

A

Heat is a form of energy

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2
Q

Explain how soup is heated

A

Soup is heated in the pan by convection. The hot soup rises. Cool soup falls to take the hot soups place

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3
Q

When heat from the stove is transferred to the pan what is it known as

A

Conduction

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4
Q

What is conduction

A

Conduction is when heat travels along a solid

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5
Q

Why does the pan handle not burn you

A

the pan handle is an insulator and therefore does not conduct heat

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6
Q

What do hot objects do to their colder surroundings

A

Radiates heat energy

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7
Q

Can radiation move through a vacuum

A

Yes

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8
Q

What does radiation not need

A

Particles to transfer heat energy

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9
Q

Explain why the surface affects the level of radiation

A

The darker the colour the more absorbent of heat

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10
Q

Explain why houses in hot countries are painted white

A

Because white paint is a poor absorber of radiant heat from the sun therefore keeping the homes cooler

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11
Q

Why are cooling fins on the back of the fridge Painted black

A

Because black paint is a good emitter of heat and will radiate heat absorbed by the coolant away from the fridge keeping it cool

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12
Q

How do we keep warm

A

We need to keep in any heat present. To do that we can wrap an object to prevent conduction and convection as air is trapped in the wrapping eg wearing a coat

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13
Q

How do we present prevent radiation?

A

We can cover an object an object in a shiny material to reflect heat back into the object eg a marathon runner in foil after a race

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14
Q

Example of preventing radiation

A

Reflective glass on skyscraper

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15
Q

Example of preventing conduction and convection

A

Penguin in Antarctic

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16
Q

Example of preventing radiation

A

Frozen dessert on a silver plate

17
Q

Example of preventing radiation

A

Marathon runner after race in foil

18
Q

What is a good insulator

A

Foil is good insulator as it reflects heat back inwards as it is silver

19
Q

Wha t is heat measured in

A

Joules/kilojoules using a joule meter

20
Q

What is temperature and what is measured in

A

Temperature is how hot is an object is and it is measured in degrees Celsius using a thermometer

21
Q

What 3 ways can heat travel

A

Conduction
Convection
Radiation

22
Q

What way does heat travel

A

Hot to cold

23
Q

Conduction

A

The transfer of heat travelling along a solid

24
Q

Explain conduction

A

As Heat energy enters the bar it cause the atoms and electrons in the bar to vibrate. The atoms will collide with each other and heat travels

25
Q

Explain why paper on copper does not burn

A

Copper is a good conductor of heat so when paper is heated on it copper will take the heat but if paper is heated on wood it would char

26
Q

Why do things feel hot and cold

A

When heat flows from an object to your hand, the object feels warm when heat flows from your hand to an object. It feels cold therefore objects at the same temperature can feel different. 

27
Q

Please, copper aluminium brass and iron in order of the worst conductor

A

Copper
Aluminium
Brass
Iron

28
Q

Where is copper often used and why?

A

Copper often used in radiator pipes and pots or pans as it is such a good conductor

29
Q

Examples of insulators

A

Oven gloves, kingspan, plastic candles, rugs carpets near the jumpers

30
Q

 what do all insulators contain?

A

Air pockets

31
Q

What is a good conductor?

A

Being a good conductor means that the object draws heat from the surrounding atmosphere and transfers it much quicker than other object 

32
Q

Explain radiators

A

When are near radiator is heated it will expand and become less dense than the surrounding air. It will therefore rise alone cooler air to take its place. This is known as convection current 

33
Q

Convection

A

 transfer of heat through liquid and gases

34
Q

Explain chimney

A

Smoke travels towards the heat and then rose into the air. This happened because the smoke moved away from the cold source to the heat by condensing and Rosa again into the chimney.

35
Q

Explain the cooling element of the fridge

A

The cooling element of a fridge is placed at the top because warm air rises once the warm air that has risen is condensed by the cooling element it will condense the bottom and keep things fresh and other heat rises and then also cooled by the cooling element 

Physics (8 decks)

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