Every warm object radiates infrared. A dull black surface is the best emitter and the best absorber, while a shiny silver surface radiates and absorbs very little. So a black surface cools quickest and a shiny one stays hot longest. Pick the surface that suits each job, then watch both cans cool.
MissionThe job: keep the drink hot. Choose the better surface.Round 1Streak 0Best 0
Which surface radiates more infrared at the same temperature?
matte black temperature90 °C
shiny silver temperature90 °C
a dull black surface emits the most, so it cools fastest; a shiny surface keeps its heat.