Cyberus wrote:
You take milk in your coffee, but you have to make the decision - do you put the milk in now, thus making the coffee cooler and thus meaning there is smaller temperature difference between coffee and the air, or do you think it'll be hotter if you wait until after the call and then put the milk in?
Actually it will still cool in the same time. The temperature gradient only defines the rate of cooling, and is a geometric function. As the temperature falls back towards room temperature its rate of cooling will decrease anyway. If you form functions from both the black and white coffee temperature loss over time, the 1st order differential will be equivalent.
And to answer the original question, I just wouldn't answer the phone.
