Hello - first post to PF. I was making my iced coffee this morning as usual by pouring hot, freshly brewed coffee atop a large cup of ice. I then began to wonder about the thermodynamics of this situation. Will the dV/dt (V=volume, t=time) affect how quickly the ice melts? As I pour in the hot coffee the ice melts, and my question is whether the newly-formed, colder liquid will help cool down the hot coffee being poured in. I am not clear on how the law of conservation of energy would apply here. In short, my question is this: to minimize melted ice, should I pour in my hot coffee a little at a time, all at once, or does it even matter?