1. Thermos Grade 8

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

3. stopper Shiny inner lining Vacuum Plastic/cork

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

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

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

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

8. Effect of the shiny surface