Heat Transfer and How a THERMOS Works

What is Heat?

• A type of light that travels between objects

• A type of energy that moves from hotter objects to colder objects

• A solid object that can be seen and touched

• A material that is used to make things hot

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Heat moves until:

• The objects stop touching each other

• One object is hotter than the other

• Both objects reach the same temperature

• • The colder object disappears

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Which of these is a good conductor of heat?

• Metal

• Plastic

• Wood

• Air

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Conduction is heat transfer that happens when:

• Heat moves through empty space

• Heat moves through a liquid or gas

• Heat moves through touching objects

• Heat disappears

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Convection happens in:

• Solids

• Liquids and gases

• Empty space

• Metals only

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Describe what happens to hot and cold air in convection.

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Radiation is heat transfer that:

• Needs something to touch to move

• Moves through liquids and solids

• Can happen even in empty space

• Only happens in metals

What is an example of heat transfer by radiation?

• Heat moving from a pot to a spoon

• Heat from the Sun warming the Earth

• Water heating in a kettle

• Heat moving through air vents

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How does a thermos stop heat transfer?

• It uses a vacuum to stop heat from moving

• It uses water to keep the temperature the same

• It lets heat move in and out freely

• It only works on cold drinks

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What type of heat transfer does a thermos block using its shiny outer layer?

• Conduction

• Convection

• Radiation

• None of the above