Question text
21 A hot meal is supplied in a container made of shiny metal foil. Why does the container help to keep the food hot? A The container traps air which increases convection. B The foil is a poor thermal conductor. C Shiny metal foil is a good absorber of infrared radiation. D Shiny metal foil is a poor emitter of infrared radiation.
21 A hot meal is supplied in a container made of shiny metal foil.
Why does the container help to keep the food hot?
A The container traps air which increases convection.
B The foil is a poor thermal conductor.
C Shiny metal foil is a good absorber of infrared radiation.
D Shiny metal foil is a poor emitter of infrared radiation.
Select your answer: