Heat transfer 3

Heat transfer 3

Multiple Choice

What is the definition of CONDUCTION?

• When heat is transferred by electromagnetic rays of light.

• When heat transfers by objects that are physically touching.

Multiple Choice

Which statement is true?

• The quicker a molecule moves, the colder it is.

• The slower a molecule moves, the warmer it is.

• The quicker a molecule moves, the warmer it is

• The movement of molecules don't affect temperature

Multiple Choice

How many kinds of heat transfer are there?

• 1
• 2
• 3
• 4 or more

Open Ended

Name the 3 types of heat transfer

• Conduction

• Convection

• Radiation

Open Ended

can you think of real-life example where conduction occurs?

Examples of Heat Conduction

• You warm your back using hot water bag

• The heat from a hot liquid makes the cup itself hot

• metal spoon in a pot becomes hot from the boiling water inside the pot.

• Chocolate in your hand will eventually melt as heat is conducted

• Ironing clothes

• If you touch a light bulb when it is on, your hand will get burned.

Open Ended

why do you think heat cannot move through liquids and gases by conduction?

Convection

Multiple Choice

Which states of matter are considered fluids?

• gas and liquid

• solids and gases

• solids and liquids

How convection works

• Convection can happen in gases or liquids (fluids)

• Think about the air. It is a gas. Its particles are quite far apart and can move about freely.

• When air is heated, its particles move faster and they move farther apart. The air expands.

• Now the air is less dense than the surrounding air and it floats upwards. It carries energy with it.

• At the same time, cooler, denser air flows in to replace it.

• So convection is the transfer of energy through a fluid when the fluid itself moves.