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How is cappuchino designed to stay hot?

I have physics homework in for tommorrow and I really need anyone's wild guesses to point me in the right direction to answering this question! I know it is a really hard question and totally pointless (don't ask me why me pysics teacher wanted me to do this) I just need some tips on how: what the serving in a white cup and saucer and the froth is important for keeping the drink hotAnd if it helps, the topic I'm doing is heat transfer through infra-red radiationThanks!


Firstly serving in a white cup is very interesting actually I have never thought of this White Cup Infrared radiation is reflected in the same way as light, thus using white means more of the radiation is reflected back into the cappuccino instead of being absorbed by the cup; therefore keeping it warmerPorcelain Cup Any material with low thermal conductivity can be used to reduce conductive heat transferCeramics are known for low thermal conductivityThis slows the conduction of heat from the cappuccino to the porcelain and air outsideFroth Most insulators in common rely on the principle of trapping air (air being a good insulator) to reduce convective and conductive heat transferThe froth on a cappuccino traps the air preventing it from conducting away heat.
1] For seawater, isn't bronze the stuff to use, not brass ? Like Admiralty Bronze ? 2] I do know that in some [fresh] waters there is a type of corrosion of brass called dezincification, where the zinc is dissolved, leaving a copper sponge3] Of what material is the baffle ? The fact that the pitting is happening at the baffle leads me to wonder if you have a galvanic couple there4] The heat exchanger manufacturer might be able willing to help.

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