Thermos Grade 8. A thermos flask is used to keep hot ( or cold drinks)

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Presentation transcript:

Thermos Grade 8

A thermos flask is used to keep hot ( or cold drinks)

stopper Shiny inner lining Vacuum Plastic/cork

Stopper It prevents heat loss by convection. Hot air particles will be trapped inside » back back

Shiny inner lining It prevents heat loss by radiation. It reflects heat inside the flask and prevents it from leaving. back

Vacuum It reduces heat loss by conduction. No particles will be present to carry heat. back

Plastic/cork It prevents heat loss by conduction. Plastic and cork are insulators back

Effect of the shiny surface