ThermosGrade 8

• A thermos

flask is used to keep hot ( or cold drinks)

stopper

Shiny inner lining

VacuumPlastic/cork

Stopper• It prevents heat loss by convection.• Hot air particles will be trapped

inside

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Shiny inner lining• It prevents heat

loss by radiation.• It reflects heat

inside the flask and prevents it from leaving.

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Vacuum• It reduces heat loss by

conduction.• No particles will be present to

carry heat.

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Plastic/cork• It prevents heat loss by

conduction.• Plastic and cork are insulators

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Effect of the shiny surface