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Please help settle a friendly argument about coffee. Does a latte cool faster than a cappuccino, all else being equal (initial temperature, volume, etc.)? My friend thinks the foam on a cappuccino will insulate it better, but I reckon this effect is offset by the cappuccino having a smaller volume of hot milk.

Happy to be in the testing team!

The heat loss from any surface is proportional to its contact area, multiplied by the temperature difference and also multiplied by a variable called the heat transfer coefficient.

For a cup of coffee, …

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