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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

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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

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What type of heat What type of heat transfer is being transfer is being

described? described?

Conduction

answer

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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

12345

What type of heat What type of heat transfer is shown transfer is shown

here? here?

answer

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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

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What is convection?What is convection?

answer

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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

12

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

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How does heat get How does heat get transferred through transferred through

space?space?

Radiation

answer

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In straight lines

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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

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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

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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

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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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