Something to note, if it works with other drinks and a spoon, it has nothing to do with strength of the drink.
You're over-thinking this, IMO. He puts a glass stirring-rod in his coffee so everybody will know that it is his coffee. In your first post you said that a spoon would do as well - I think that is supposition on your part and not part of the problem that he posed to you.then keep the oxygen in the liquid, contain its freshness and taste?
Agreed, despite all the solutions I'm still stuck with mine, for the reason I pointed out in response to oldfart above.You're over-thinking this, IMO. He puts a glass stirring-rod in his coffee so everybody will know that it is his coffee. In your first post you said that a spoon would do as well - I think that is supposition on your part and not part of the problem that he posed to you.
No, did you read it? It's about storing coffee by ensuring as little moisture as possible. Not applicable here and certainly not with other beverages and spoons.
So the whole "works with other drinks" is your own creation? Or is it only with coffee?He puts a glass rod in his coffee and tells everyone to guess why he does, offers money to the one that comes up with the right, scientific answer.
A metal spoon would do as well, I quote.
It's not for stirring, nor identifying his cup.
This would be the same basis for putting milk into the cup first, the difference in specific heat values of the milk and glass help prevent the warm drink splitting the china cup.there's this thing that if you put some kind of conductor in a cup while pouring hot liquid inside it will not blow due to temperature changes. say if the cup is cold.
And a spoon certainly doesn't have the 'fear factor' that a glass rod from the lab has!Still, it is a method of identifying his drink, IMO. A spoon would work as well, but not ANY spoon. A fancy monogrammed spoon would work very well, but it's not quite as elegant as using a glass stirring rod from the lab.
The teacher has rejected any heat related issues. What mathplease has suggested is also quite plausible (considering that all other options have been so far inconsistent with the question or the incorrect answer). This is an interesting thread by the way. I would like to wait for an answer... Though this might turn out to be one of those sly tricks played by old timers (you know, the teacher may just say that there is no particular reason and that all this was just to bring a new perspective of thinking to the students)glass has a higher heat capacity than metal (I think?) so its used to cool his drink without adding milk. Yes, it would work with a metal spoon but maybe not as well.
But he said it also works with a spoon.Maybe he doesn't want the acids in the coffee to react with a spoon. Hence glass?
It sounds good, making people come up with 'scientific' solutions to the problem he has posed but I'm not sure if it is useful in the long wrong. Especially if he's offering a cash prize to the person who correctly works it out when there's nothing to solve.Maybe he just likes hearing the questions which it generates.