For instance, I make myself some hot coffee and I want to turn it to iced coffee. Stirring it seems to cool it down much faster than letting the ice just sit in the coffee, however, from what I have read, stirring the ice melts the ice faster and more even though it cools it down faster. Why? Is this even correct?
Also, would the ice just sitting in the hot coffee melt roughly the same amount as the stirred once the coffees reaches the desired cold temperatures? Idk we can make one up, coffee from 160°f to 40°f, I guess. I also generally fill my coffee cup completely with ice as I’m sure the amount of ice changes this.
I hope this makes sense and I tagged the question correctly. Thank you,
In: 14
Think of the exchange of energy taking place as of a queue of toddlers. Which would be faster: tell each kid to take a piece of candy and go play in the sandbox, or ask them to take one and then to keep passing on the candy to the kid behind them until the candy bowl is empty?
Energy transfer happens faster the more of a difference there is between the sides taking place in the exchange. The higher the temperature, pressure, voltage, force, elevation, etc. difference the faster the process will go.
Hot water closest to the ice will cool down fast, but the rate at which it keeps cooling down further will also drop substantially. This will form a sort of an insulating layer. By stirring you are constantly introducing hot[ter] water and keeping the rate of the exchange up.
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