Heat Transfer Lesson & Quiz

Heat Transfer Lesson

TAKE NOTES as you move through the lesson AND watch the videos - they will help you with the quiz questions at the end!

Heat Transfer

Have you ever wondered how heat travels? In this unit, we will explore how heat is transferred at different rates.  

Imagine you have a hot bowl of soup.

Before adding the soup to the bowl the bowl was not warm.

After you added the hot soup the bowl became warm.

Why do you think the bowl became warm?

Where did the heat come from?

Thermal Energy

Heat or thermal energy is created by the movement of particles. Thermal energy can be transferred through conduction, convection, and radiation.

What is Heat Transfer?

Heat (energy) always moves from a warmer substance to a cooler substance.

What is Heat Transfer?

The heat will continue to move until both substances are at the same temperature.

Examples:

• You touch a black car in the summer and the heat from the car transfers into your hand.

• A breeze makes you feel cooler because the wind transfers heat away from your body.

NON Examples:

• You feel the cold of a winter day because the cold air transfers into you.

• Your Coke in a cooler gets cold because the cold from the ice moves into the Coke.

The greater the difference in temperature between the substances, the faster the heat will transfer!

This is what creates WIND!

There are three types of heat transfer.

Watch the video to learn more.

Take notes!

• Conduction

• Convection

• Radiation

Multiple Choice

The name for heat transfer between two solids that are in direct contact or touching on another is...

• insulation

• radiation

• convection

• conduction

Conduction

• Heat transfer by conduction is the transfer of heat through direct contact.

• Molecules transfer energy to the molecules next to them.

• The molecules do not have to be the same substance.

No matter what it feels like, cold does not transfer into your body.

• What is really happening here?

• Why do you wear heavy clothes when it’s cold outside?

Radiation

Heat transfer by radiation is the transfer of heat through electromagnetic waves.

Radiation

There is no direct contact between the substances.

Example 1

Convection

Heat transfer by convection is the transfer of heat through the fluid (liquids and gases) movement of currents.

Warm fluids (liquids & gases) rise, cool down, sink, and then are warmed again.

The radiator warms the room by warming the air around it. Then the warm air transfers heat to the rest of the room through convection.

As air above the road warms up, it rises and is replaced by cooler air, forming a convection current.

Multiple Choice

Walking on the warm sand sand with your bare feet demonstrates this type of heat transfer.

• conduction

• convection

• radiation

Multiple Choice

___________________ is the type of heat transfer that occurs in fluids, such as warm air rising and cold air sinking; creating wind.

• Convection

• Conduction

• Radiation

• insulation.

Multiple Choice

Why do we wear sweaters in cold weather?

• To keep cold out.

• To generate heat.

• To reduce heat loss.

• All of the above.

Multiple Choice

Near the ceiling of a room the air is warmer; the warm air rises because of

• conduction

• convection

• radiation

Multiple Choice

Transfer of thermal energy through "space"

• conduction

• convection

• radiation

Multiple Choice

A group of friends gather around a fire to stay warm.

• conduction

• convection

• radiation

Multiple Choice

Johnny accidentally grabbed the handle of the hot pot.

• conduction

• convection

• radiation

Multiple Choice

What happens when ice cubes melt in a glass?

• Heat travels from the ice to the warmer water.

• No energy is transferred.

• Heat is transferred from the warmer water to the ice cubes.

• The water warms up due to the humidity

Multiple Choice

The man goes to take the hot pot off the stove with his bare hands.

• conduction

• convection

• radiation

Multiple Choice

Warm air is __________ dense than cold air and rises creating convection currents.

• more

• less

Multiple Choice

Warm air rises and the cool air sinks demonstrates this type of heat transfer.

• conduction

• convection

• radiation

• Insolation

Multiple Choice

All of the following are examples of convection currents, except:

• Warm air rising in a house

• Cold water sinking to the bottom of the lake

• Water flowing through pipes

• Steam from hot soup rising into the air

Multiple Choice

Convection currents occur:

• Only in liquids

• When a dense substance is warmer than a less dense substance

• In both liquids and gases

• Weakly in solids

Multiple Choice

Heat from the Sun reaches Earth through which type of heat transfer?

• Conduction

• Radiation

• Convection

• All of the above

Multiple Choice

When you heat a pot on a stove, the handle gets warm. Which type of heat transfer is responsible?

• Conduction

• Radiation

• Convection

• All of the above

Multiple Choice

When two things are the same temperature:

• They have the same number of molecules

• Their molecules stop moving

• Their molecules move at the same average speed

• Heat transfer between the two things stops

Multiple Choice

What happens when a cold drink sits in a hot room?

• It remains cold

• It gets warmer

• It starts boiling

• It starts to freeze