heat

Question 1

What are the 3 types of heat transfer

Answer 1

Convection, radiation and conduction

Question 2

What is convection

Answer 2

Convection is a form of heat transfer that occurs only in gases or liquids. Convection currents form by hot, less dense air rising and cooler, more dense air sinking.

Question 3

What is radiation

Answer 3

Heat transfer through waves where no contact is required

Question 4

What is conduction

Answer 4

Heat transfer in solids through contact

Question 5

Examples of convection

Answer 5

sea breeze and land breeze, boiling water, air inside hot air balloon

Question 6

Examples of radiation

Answer 6

Warmth from fire, microwave, heat from sun

Question 7

Examples of conduction

Answer 7

Hot coffee heating outside of mug, ironing clothes, cooking food in a frying pan

Question 8

What is a conductor

Answer 8

A material that transfers heat easily

Question 9

What is an insulator

Answer 9

A material that blocks or slows heat transfer

Question 10

Examples of conductors

Answer 10

Coffee mugs, pots, metal cutlery

Question 11

Conductor materials

Answer 11

Copper, steel, iron

Question 12

Examples of insulators

Answer 12

Glass cups, balloons, wood

Question 13

Insulator materials

Answer 13

Wood, glass, rubber

Question 14

Heat energy always flows from the object with the ___ temperature

Answer 14

Higher. Heat energy always transfers from the hotter object

Question 15

Why does a balloon expand when heated

Answer 15

Because when the balloon is heated the particles inside start moving faster which increases pressure. The increased pressure causes the balloon to expand.

Question 16

What happens to a railroad on a hot day?

Answer 16

Heat causes steel railroad tracks to expand and to buckle under the extra stress. The heat transfer from the sun to the track is radiation.

Question 17

What happens to a spoon when it is heated over a flame

Answer 17

The heat from the flame is radiation waves. When the spoon is heated it becomes hot. If a spoon was to be touching the flame this would then be conduction.

Question 18

What causes wind

Answer 18

The difference in temperature. Warm air rises while cool air sinks producing convection currents.

Question 19

Is hot or cold air more or less dense.

Answer 19

Hot air is less dense so it rises.
Cool air is more dense so it sinks

Question 20

White or Black

Answer 20

White reflects heat while black absorbs it