Transfer of Heat

What is conduction?

• Transfer of heat through electromagnetic waves

• Transfer of heat through fluid movement

• Transfer of heat through direct contact between particles of a substance

• Transfer of heat through sound waves

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Give an example of conduction.

• Touching a metal spoon that has been sitting in a hot pot of soup

• Blowing on a bowl of hot soup

• Stirring a pot of boiling water with a wooden spoon

• Putting ice in a glass of water

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What is convection?

• Transfer of heat through the movement of fluids

• A type of dance

• A type of dessert

• A type of bird

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NGSS.MS-ESS2-6

Give an example of convection.

• Lighting a candle

• Baking a cake in the oven

• Freezing water in the freezer

• Boiling water in a pot

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What is radiation?

• Radiation is the transfer of heat through convection.

• Radiation is the transfer of heat through electromagnetic waves.

• Radiation is the transfer of heat through physical contact.

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NGSS.MS-PS3-4

Give an example of radiation.

• Light from a flashlight

• Sound from a speaker

• Microwaves from a cell phone

• Heat from the sun

What is insulation and how does it work?

• Insulation is a material that increases the transfer of heat by trapping air pockets within its structure.

• Insulation is a type of fabric that has no effect on the transfer of heat.

• Insulation is a process of removing air pockets to allow heat to transfer more easily.

• Insulation is a material that reduces the transfer of heat by trapping air pockets within its structure.

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NGSS.MS-PS3-3

What are some common materials used for insulation?

• fiberglass, foam, cellulose, mineral wool

• wood, metal, plastic

• cotton, silk, linen

• paper, glass, rubber

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Explain how a thermos flask prevents heat transfer.

• The thermos flask uses a special type of metal that absorbs heat and prevents it from escaping

• The flask has a built-in heater that keeps the liquid warm

• The vacuum between two walls of the container reduces heat conduction and convection, and the inner wall is coated with a reflective material to minimize heat radiation.

• The flask is made of a material that conducts heat very slowly

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NGSS.MS-PS3-3

What are the key components of a thermos flask that aid in heat retention?

• Triple-walled vacuum insulation and non-reflective lining

• Single-walled vacuum insulation and reflective lining

• No insulation and non-reflective lining

• Double-walled vacuum insulation and reflective lining

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