Heat Transfer

Heat Transfer

​The transfer of heat energy from one substance to another through touch

Conduction

​Transfer of heat within a gas or liquid

Convection

​Transfer of heat without matter to carry it

Radiation

Conduction

Solids, touching, Moving particles

the process where heat energy is transferred through direct contact between molecules of a substance, with no bulk movement of the material, meaning heat travels from a hotter region to a cooler region by vibrating molecules colliding with each other and passing on the energy; essentially, heat transfer through physical contact between objects. 

Multiple Choice

Billy Bob wants to demonstrate the transfer of thermal energy. He holds an ice cube in his hand. The ice cube begins to melt. Which of the following best describes the process of thermal energy the student is demonstrating?

• Billy Bob is demonstrating conduction. Heat is being transferred from his hand to the ice cubes through touch.

• Billy Bob is demonstrating conduction, where heat is transferred from the ice cubes to his hand.

• Billy Bob is demonstrating convection, where heat is transferred from his hand to the ice cubes.

• Billy Bob is demonstrating convection, where heat is transferred from the ice cubes to his hand.

Multiple Choice

Kipton places a metal bar into a fire. Why does the end not in the fire also get hot?

• Conduction

• Convection

• Radiation

• Induction

Convection

​Liquids and Gases

a type of heat transfer that can only happen in liquids and gases, because it involves those liquids or gases physically moving. Convection happens when there is a difference in temperature between two parts of a liquid or gas. The hot part of a fluid rises, and the cooler part sinks. Examples include a heater warming a room or boiling water.

Multiple Choice

If Cotton opens the door between two rooms, what will happen to the temperature in the two rooms?

• The temperature in both rooms will become equal over time.

• The temperature in each room will remain unchanged.

• The warmer room will cool down to freezing.

• The colder room will warm up and the warmer room will get hotter.

Multiple Choice

When tectonic plates shift, the ground shakes violently, causing an earthquake. What process is responsible for earthquakes?

• Convection-the circular movement of liquid magma that pushes and moves floating tectonic plates.

• Evaporation-the transformation of water from tectonic plates to water vapor that pulls on liquid magma.

• Conduction-The transfer of thermal energy from liquid magma to tectonic plates that moves liquid magma

• Radiation-the movement of electromagnetic waves through liquid magma that pushes on tectonic plates.

Multiple Choice

Which of the following shows convection?

• Melting chocolate bars in a microwave at different settings.

• Pouring cold, colored water into a bowl of hot water that is another color.

• Leaving a glass of ice water outside in the direct sunshine.

• Placing a spoon that is room temperature on top of a hot burner on a stove.

Heat will increase kinetic energy. This creates a decrease in the density of a mixture of gases. Hot water will be less dense.

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Heat and Density

Multiple Choice

Hot water is LESS dense than cold water.

• True

• False

Multiple Choice

Heat will increase kinetic energy.

• True

• False

Radiation

Can move without matter

the process where heat energy is transferred through electromagnetic waves, meaning it can travel through a vacuum without needing a medium to carry the heat, like the way the sun warms the Earth, where heat is transmitted through space via radiation waves. 
Examples: microwave; sun

Multiple Choice

Teej wants to do an investigation to show the transfer of heat energy without matter. Which of the following would best show this?

• An investigation of radiation by electromagnetic waves through space

• An investigation of radiation through a current in fluid

• An investigation of conduction through collisions between particles in space

• An investigation of conduction through the movement of particles through a solid

Match

Match the type heat transfer to the example

• radiation

• conduction

• convection

using a microwave

using an electric blanket

ocean currents

• using a microwave

• using an electric blanket

• ocean currents

Categorize

Options (9)

standing near fire

standing near grrill

Pond being warmed by sun

boiling water

using a heater in car

cooking pizza in the oven

walking on sand barefoot

holding an ice cube in your hand

getting into a hot tub

Organize these options into the right categories

Radiation

Convection

Conduction