Newton´s Law of Cooling

[mprm86]

I know what this law says, but I don´t know where does it comes from. Could somone please help me with the derivation of this law?
Thanks in advance.

 

[HallsofIvy]

It's purely a matter of experimental evidence- heat flows from a warmer body to a cooler one at a rate proportional to the difference in temperatures.

 

[mprm86]

OK Thanks.

 

[mukundpa]

you may derive this law from Stefan's law of black body radiation with the approximation that the temperature difference between the body and surrounding is not much large.