A cup of very hot coffee that you must drink.

imageThere is a cup of very hot coffee that you must drink in five minutes.
How better to do it ?

a) Immediately add cold milk and then wait five minutes before drinking

b) Add cold milk at the last moment before drinking

 

 


Solution. Posted on Saturday, November 22, 2014.


 
According the Newton’s Law of Cooling, the rate of change of the temperature is proportional to the difference between the temperature of the body and the ambient temperature. Therefore, if milk is not added immediately, the temperature difference is bigger and coffee will cool faster. Finally, we should add cold milk at the last moment before drinking.

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