Will a black container of hot water lose heat faster or slower than a white container of hot water?
Asked by: Katy Ward
A black body is assumed to be a perfect radiator of heat.
A black container of water can be said to be closer to a black body than a white container. Kirchoff's laws of radiation make it evident that a BLACK BODY IS NOT ONLY A PERFECT ABSORBER BUT ALSO A PERFECT emitter of heat. Hence the black container will cool down faster.
Wear a black cotton shirt in summer, you'll sweat!
Wear a cotton (black) shirt in winter you'll freeze!
Answered by: Akhilesh, Undergrad, India
Our server costs have gone up and our advertising revenue has gone down. You do the math! If you find our site useful, consider donating to keep us going. Thanks!
'In a way science is a key to the gates of heaven, and the same key opens the gates of hell, and we do not have any instructions as to which is which gate.
Shall we throw away the key and never have a way to enter the gates of heaven? Or shall we struggle with the problem of which is the best way to use the key?'
Richard Phillips Feynman