Society & Culture3 mins ago
Mug Of Coffee/thermodynamics
17 Answers
Does anyone know the answer to this:
Some time ago, I was involved in a discussion re heating up mugs before dispensing coffee or tea into them, the question being - will this slow down the natural cooling of the liquid or actually speed it up?
Some time ago, I was involved in a discussion re heating up mugs before dispensing coffee or tea into them, the question being - will this slow down the natural cooling of the liquid or actually speed it up?
Answers
Best Answer
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For more on marking an answer as the "Best Answer", please visit our FAQ.I remember doing this in physics 35 years ago, if you pour a hot liquid into a cold vessel the temperature of the combined liquid/cup will reduce by a given amount depending upon the temperature coefficient of the vessel. Therefore heating the vessel will reduce the amount the liquid cools by. Type of material and weight of vessel will have a significant effect on the cooling. This is why espresso machines in coffee shops have the cups on top so that they are kept warm to prevent the coffee cooling too much when it is poured.
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Great responses so far. Thanks.
I was thinking that if the mug was pre-warmed then the cooling of the added hot liquid would depend on the material that the container was made of as Woofgang suggested.
I wonder then what would happen to a mug of hot coffee that was contained within a pre-warmed stainless steel mug compared to a similarly hot drink dispensed into a cold stainless steel mug, additionally, I wonder what effect the ambient temperature would have on the speed of cooling.
I was thinking that if the mug was pre-warmed then the cooling of the added hot liquid would depend on the material that the container was made of as Woofgang suggested.
I wonder then what would happen to a mug of hot coffee that was contained within a pre-warmed stainless steel mug compared to a similarly hot drink dispensed into a cold stainless steel mug, additionally, I wonder what effect the ambient temperature would have on the speed of cooling.
It is the same thing.... a pre-warmed stainless steel mug will draw less heat from the drink so takes longer to cool.
The ambient temperature always has some bearing on the cooling, however small. Hot coffee in a warm SS mug in a cold room will cool faster than in a warm room. The mug acts as a sort of conducter between the liquid and the room. One of those thermo mugs will minimise the heat transfer so keeps the liquid warm longer.
The ambient temperature always has some bearing on the cooling, however small. Hot coffee in a warm SS mug in a cold room will cool faster than in a warm room. The mug acts as a sort of conducter between the liquid and the room. One of those thermo mugs will minimise the heat transfer so keeps the liquid warm longer.
Pitzer I thought gave a good answer
This is a straightforward q on heat content ( em ess theta and all that) and cooling (Newton's 5/4ths law and all that)
Since you arent making your cuppa coughee work,
it isnt thermodyamics wh however is a cute word to use in a headline
Since youa re heating the cup, you are increasing the total heat in the system and so it will take longer to cool.
I love the hot plate analogy and wish I thought of it myself (I love it so much)
I think we all assume that something at 37'C or whatever will have the same cooling characteristics no matter how you arrived at that final temperature.
IN the hot and cold water red herring, that clearly doesnt apply.
This is a straightforward q on heat content ( em ess theta and all that) and cooling (Newton's 5/4ths law and all that)
Since you arent making your cuppa coughee work,
it isnt thermodyamics wh however is a cute word to use in a headline
Since youa re heating the cup, you are increasing the total heat in the system and so it will take longer to cool.
I love the hot plate analogy and wish I thought of it myself (I love it so much)
I think we all assume that something at 37'C or whatever will have the same cooling characteristics no matter how you arrived at that final temperature.
IN the hot and cold water red herring, that clearly doesnt apply.
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