Re: [math-fun] Chinese tea puzzle
Wow, I didn't know that C13 was 1.1% abundant: https://en.wikipedia.org/wiki/Carbon-13 and you can use this in mass spectrometry to count carbons in a molecule, or that there are three different kinds of photosynthesis, and Bill & Melinda Gates are funding a project to change rice from "C3" to "C4", promising a 50% yield increase, (Evil GMO! I'd rather you starve.) and that C13 enrichment may inhibit free radical aging. But how much C13 is too much? Deuterium can be toxic by deranging relative enzyme efficiencies. Is anybody working on enzymatic isotope separation? --rwg I used "puzzle" in the subject line in keeping with math-fun tradition of implying I know the answer: The large surface area of the unimmersed bag outcompetes the cup liquid surface, so you should dunk infrequently. But now I'm less sure. On 2016-05-28 10:12, Eugene Salamin via math-fun wrote:
Thermal conductivity at 25 C in W m^-1 K^-1
Silver 429 Copper 401 Diamond 2200C-12 enriched diamond 3300
-- Gene
From: Henry Baker <hbaker1@pipeline.com> To: math-fun <math-fun@mailman.xmission.com> Sent: Saturday, May 28, 2016 10:03 AM Subject: Re: [math-fun] Chinese tea puzzle
A *silver* "tea spoon" duh's the trick just fine; watch out not to burn your fingers on said spoon.
https://en.wikipedia.org/wiki/Silver
"[Silver] however, possesses the highest electrical conductivity, *thermal conductivity,* and reflectivity of any metal."
At 07:48 AM 5/28/2016, Joerg Arndt wrote:
* Fred Lunnon <fred.lunnon@gmail.com> [May 28. 2016 16:34]:
Have you tried putting it in the 'fridge? WFL
Too high tech!
For someone who hates drinks being very hot, likes coffee, is impatient, and doesn't want ice cubes (too much hassle, alters taste), I dug up an aluminium rod, about 15 mm in diameter and 15 cm in length. You only need to dip that into the drink _shortly_ to get the temperature you want.
Cue happy pal.
Notice that removing some of that 1.1% of C13 raises the heat conductivity of diamond by 50%. Magic or typo? Rich ------- Quoting Bill Gosper <billgosper@gmail.com>:
Wow, I didn't know that C13 was 1.1% abundant: https://en.wikipedia.org/wiki/Carbon-13 and you can use this in mass spectrometry to count carbons in a molecule, or that there are three different kinds of photosynthesis, and Bill & Melinda Gates are funding a project to change rice from "C3" to "C4", promising a 50% yield increase, (Evil GMO! I'd rather you starve.) and that C13 enrichment may inhibit free radical aging. But how much C13 is too much? Deuterium can be toxic by deranging relative enzyme efficiencies. Is anybody working on enzymatic isotope separation? --rwg
I used "puzzle" in the subject line in keeping with math-fun tradition of implying I know the answer: The large surface area of the unimmersed bag outcompetes the cup liquid surface, so you should dunk infrequently. But now I'm less sure.
On 2016-05-28 10:12, Eugene Salamin via math-fun wrote:
Thermal conductivity at 25 C in W m^-1 K^-1
Silver 429 Copper 401 Diamond 2200C-12 enriched diamond 3300
-- Gene
From: Henry Baker <hbaker1@pipeline.com> To: math-fun <math-fun@mailman.xmission.com> Sent: Saturday, May 28, 2016 10:03 AM Subject: Re: [math-fun] Chinese tea puzzle
A *silver* "tea spoon" duh's the trick just fine; watch out not to burn your fingers on said spoon.
https://en.wikipedia.org/wiki/Silver
"[Silver] however, possesses the highest electrical conductivity, *thermal conductivity,* and reflectivity of any metal."
At 07:48 AM 5/28/2016, Joerg Arndt wrote:
* Fred Lunnon <fred.lunnon@gmail.com> [May 28. 2016 16:34]:
Have you tried putting it in the 'fridge? WFL
Too high tech!
For someone who hates drinks being very hot, likes coffee, is impatient, and doesn't want ice cubes (too much hassle, alters taste), I dug up an aluminium rod, about 15 mm in diameter and 15 cm in length. You only need to dip that into the drink _shortly_ to get the temperature you want.
Cue happy pal.
math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
This is for real. The heat content of a crystal is mainly due to phonons, quanta of vibration. Heat conduction is due to the transport of phonons. Phonons are scattered by inhomogeneities in the lattice, so that thermal conductivity is very sensitive to impurities, such as the random distribution of different mass isotopes. Diamond is quite a remarkable substance. Since it is thermodynamically unstable with respect to graphite under ordinary temperature and pressure, its synthesis is tricky. The preferred technology today is chemical vapor deposition (CVD). On the other hand, it is just carbon. I expect that by year 2100, diamond synthesis will have become so cheap that recycling centers will have a bin for diamonds. I wrote a report on diamond for a class I took on optomechanics at the University of Arizona. http://fp.optics.arizona.edu/optomech/student%20reports/synopsis/SalaminRepo... http://www.tlchm.bris.ac.uk/pt/diamond/pdf/rscreview.pdf -- Gene From: "rcs@xmission.com" <rcs@xmission.com> To: math-fun@mailman.xmission.com Cc: rcs@xmission.com Sent: Sunday, May 29, 2016 10:12 AM Subject: Re: [math-fun] Chinese tea puzzle Notice that removing some of that 1.1% of C13 raises the heat conductivity of diamond by 50%. Magic or typo? Rich ------- Quoting Bill Gosper <billgosper@gmail.com>:
Wow, I didn't know that C13 was 1.1% abundant: https://en.wikipedia.org/wiki/Carbon-13 and you can use this in mass spectrometry to count carbons in a molecule, or that there are three different kinds of photosynthesis, and Bill & Melinda Gates are funding a project to change rice from "C3" to "C4", promising a 50% yield increase, (Evil GMO! I'd rather you starve.) and that C13 enrichment may inhibit free radical aging. But how much C13 is too much? Deuterium can be toxic by deranging relative enzyme efficiencies. Is anybody working on enzymatic isotope separation? --rwg
I used "puzzle" in the subject line in keeping with math-fun tradition of implying I know the answer: The large surface area of the unimmersed bag outcompetes the cup liquid surface, so you should dunk infrequently. But now I'm less sure.
On 2016-05-28 10:12, Eugene Salamin via math-fun wrote:
Thermal conductivity at 25 C in W m^-1 K^-1
Silver 429 Copper 401 Diamond 2200C-12 enriched diamond 3300
-- Gene
From: Henry Baker <hbaker1@pipeline.com> To: math-fun <math-fun@mailman.xmission.com> Sent: Saturday, May 28, 2016 10:03 AM Subject: Re: [math-fun] Chinese tea puzzle
A *silver* "tea spoon" duh's the trick just fine; watch out not to burn your fingers on said spoon.
https://en.wikipedia.org/wiki/Silver
"[Silver] however, possesses the highest electrical conductivity, *thermal conductivity,* and reflectivity of any metal."
At 07:48 AM 5/28/2016, Joerg Arndt wrote:
* Fred Lunnon <fred.lunnon@gmail.com> [May 28. 2016 16:34]:
Have you tried putting it in the 'fridge? WFL
Too high tech!
For someone who hates drinks being very hot, likes coffee, is impatient, and doesn't want ice cubes (too much hassle, alters taste), I dug up an aluminium rod, about 15 mm in diameter and 15 cm in length. You only need to dip that into the drink _shortly_ to get the temperature you want.
Cue happy pal.
participants (3)
-
Bill Gosper -
Eugene Salamin -
rcs＠xmission.com