thermos grade 8. a thermos flask is used to keep hot ( or cold drinks)
Post on 18-Jan-2018
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stopper Shiny inner lining Vacuum Plastic/cork
TRANSCRIPT
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
» 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
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