Heat Transfer Concepts

Describe how heat is transferred by conduction.

• Conduction occurs only in gases and not in solids or liquids.
• Heat is transferred by conduction through radiation.
• Heat transfer by conduction requires a vacuum to occur.
• Heat is transferred by conduction through direct contact and energy transfer between particles.

Explain how the heat is transferred from a hot stove to the food in a stainless steel pot.

• Heat is transferred from the stove to the food in the pot through conduction.
• Heat is transferred through evaporation of water in the pot.
• Heat is transferred by convection from the air around the stove.
• Heat is transferred through radiation from the stove to the pot.

What is convection?

• Convection is the transfer of heat through the movement of fluids and gases.

• Convection is the process of heat transfer through solid materials.
• Convection is the transfer of heat through radiation without any movement.
• Convection occurs only in gases and not in liquids.

what is heat transfer by radiation?

• Heat transfer by radiation is the movement of particles from one object to another.
• Heat transfer by radiation is the transfer of energy through electromagnetic waves through open space.

• Heat transfer by radiation requires a physical medium.
• Heat transfer by radiation only occurs in liquids and gases.

Convection can occur in solids. True or False. Explain your answer.

• True

• False

Explain why it is best to place heaters near the floor and why an air conditioner is best placed near the ceiling.

• Heaters should be placed on shelves to maximize heat distribution.
• Heaters should be installed in windows to allow heat to escape easily.
• Heaters should be near the floor to allow warm air to rise, while air conditioners should be near the ceiling to let cool air descend.
• Air conditioners work best when placed on the floor to cool the room quickly.

The law of conservation of energy states. . .

• Energy can be destroyed but not created.
• Energy is always lost in transformations.
• Energy cannot be created or destroyed, only transformed.
• Energy can be created from nothing.

Give an example where energy changes from one type of energy to another type.

• The conversion of chemical energy in fuel to kinetic energy in a moving car.
• The change of sound energy to light energy in a flashlight.
• The conversion of electrical energy to thermal energy in a toaster.
• The transformation of gravitational potential energy to elastic potential energy in a stretched spring.

Name insulation materials that will be good at preventing heat loss and heat gain in a roof of a house.

• Metal sheets
• Wood shavings
• Concrete blocks
• Fiberglass, foam board, spray foam, cellulose, mineral wool

Explain how insulation materials prevents heat loss and gain.

• Insulation materials only work in cold climates and have no effect in warm climates.
• Insulation materials are made of metals that conduct heat efficiently.
• Insulation materials reduce heat transfer by trapping air, minimizing conduction, convection, and radiation.
• Insulation materials increase heat transfer by allowing air to flow freely.