Question

A barista brews a cup of coffee (300 cm3 ) at 200 degrees F. A customer asks that the barista add cold milk (40 degrees F) until the mixture reaches just the right temperature to drink (130 degrees F). What volume of milk should the barista add?

You can assume: • Milk and coffee are both just like water, in terms of all their material properties (density, specific heat, etc). • The cup is insulated, so no heat flows anywhere, except between the milk and the coffee.

Answer 1