tag:blogger.com,1999:blog-22973357.post5580479188707223686..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Blaise Pascal, Florin Périer, and the Puy de Dôme experimentSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger20125tag:blogger.com,1999:blog-22973357.post-7621768780228412232014-05-04T18:49:07.246-04:002014-05-04T18:49:07.246-04:00Thank you very much for a great post. Most of the ...Thank you very much for a great post. Most of the science books are written in a language that is hard to capture for many students. Your article proves that history and physics can be told in simpler and interesting to read English!Manechkahttps://www.blogger.com/profile/06766109931557508875noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-69731187871496179962007-11-23T17:05:00.000-05:002007-11-23T17:05:00.000-05:00Stefan, I think the quote is told to come from Pas...Stefan, I think the quote is told to come from Pascal himself, but again I do not remember what treatise or discourse.Alejandro Riverohttps://www.blogger.com/profile/16181521111080562335noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-72488264421053452902007-11-22T22:24:00.000-05:002007-11-22T22:24:00.000-05:00Dear Stefan,A marvellous story! I love the way exp...Dear Stefan,<BR/><BR/>A marvellous story! I love the way experiment was king! If only we could do quantum field theory experiments so readily!Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-16760334177338807372007-11-22T20:23:00.000-05:002007-11-22T20:23:00.000-05:00stefan said: "Well, that's more the attitude of mo...stefan said: "Well, that's more the attitude of modern-day crumpy old amateur scientist and Einstein denialists ;-)... "<BR/><BR/>Yes, exactly. But still I would think that the aetherists in those days would have put up a bit of a fight. I wonder how long it took for people to accept the correct explanation, and whether there were many diehards who cooked up excuses, like the MOND diehards Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-9028983631864988952007-11-22T18:05:00.000-05:002007-11-22T18:05:00.000-05:00Hi Alejandro,thanks for sharing that anecdote! But...Hi Alejandro,<BR/><BR/><BR/>thanks for sharing that anecdote! But I have to admit, the limit height for pumps is not at all intuitively obvious...<BR/><BR/>BTW, this quotation, do you remember the author, or the circumstances? I have read it somewhere just when preparing the post, but alas, I do not remember where and cannot find it anymore...<BR/><BR/><BR/>Hi Plato,<BR/><BR/>true, that Pascal stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-21135964342692515692007-11-22T16:55:00.000-05:002007-11-22T16:55:00.000-05:00Hi dr who,... it's just that the density of the ae...Hi dr who,<BR/><BR/><I>... it's just that the density of the aether up there on the mountain is different, or something.</I><BR/><BR/>Well, that's more the attitude of modern-day crumpy old amateur scientist and Einstein denialists ;-)... <BR/><BR/>Descartes, for example, had no problem at all to accept the air pressure as the force balancing the weight of the column of the fluid. But that didn'tstefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-49788430276343526662007-11-22T16:35:00.000-05:002007-11-22T16:35:00.000-05:00Hi Lex,The Torr is still in use - most high vacuum...Hi Lex,<BR/><BR/><BR/><I>The Torr is still in use - most high vacuum systems measure the pressure in mTorr.</I><BR/><BR/>thank you very much for your remark - that allows me to explain that my focus was on the "official" when I said "now officially out of use", and I wanted to make the point that in contrast to the pascal, the torr is not a SI unit. Moreover, in Gemany, and probably in the wholestefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-22718050760315740192007-11-22T16:14:00.000-05:002007-11-22T16:14:00.000-05:00Hi anonymous -thank you very much for yourapprecia...Hi anonymous -<BR/><BR/><BR/>thank you very much for yourappreciation and attentive reading - I have fixed the "1947", it's 1647 now.<BR/><BR/>The 1867, however, is correct, if we trust the <A HREF="http://gallica.bnf.fr/Catalogue/noticesInd/FRBNF30435306.htm" REL="nofollow">catalogue of the Bibliothèque Nationale de France</A>. The illustration is from a 19th century popular science stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-50776620035488771922007-11-22T15:36:00.000-05:002007-11-22T15:36:00.000-05:00Nice article. You may want to fix one 1947 to 1647...Nice article. You may want to fix one 1947 to 1647, and I guess the 1867 is supposed to be 1767, or else the 18th century should read the 19th.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-91683676546592329112007-11-22T11:40:00.000-05:002007-11-22T11:40:00.000-05:00Wonderful Post. I like this kind of history being ...Wonderful Post. <BR/><BR/>I like this kind of history being explained in such a way, while it holds us to what is happening today in cosmology, it is also explaining the process and how we got here.<BR/><BR/> Ideas, about what is emergent. Where our universe came from and what it was before it became the way it is today.<BR/><BR/>Please allow me to detract Stefan for a moment from your post a bitPlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-86095711257726070062007-11-22T11:01:00.000-05:002007-11-22T11:01:00.000-05:00About the 10m limit, I run into a personal anecdot...About the 10m limit, I run into a personal anecdote in a small rural town one year ago. Someone gave us some old pumps, and asked to go to the local workshop to ask about them. The Master of the workshop came jointly with an apprentice, and told to my friend and me: "this is a suction pump, you can use it in non-clear water, but you can not use it to raise water higher than seven meters". And he Alejandro Riverohttps://www.blogger.com/profile/16181521111080562335noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-9169211725577114852007-11-22T10:50:00.000-05:002007-11-22T10:50:00.000-05:00I will put quotes, but I am getting it from heart,...I will put quotes, but I am getting it from heart, so not accurrate:<BR/><BR/>"<I>The followers of Aristotle tell us that these experiments do indeed show that Nature abhors vacuum, and that it is because of it that the mercury climbs the tube. And I say them: 'Does Nature abhor the vacuum more in Paris than in the Puy de Dome?' </I>"Alejandro Riverohttps://www.blogger.com/profile/16181521111080562335noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-79109431264023310872007-11-21T21:50:00.000-05:002007-11-21T21:50:00.000-05:00http://arXiv.org/abs/0706.2031Physics Today 57(7) ...http://arXiv.org/abs/0706.2031<BR/>Physics Today 57(7) 40 (2004)<BR/>http://physicstoday.org/vol-57/iss-7/p40.shtml<BR/>http://cfa-www.harvard.edu/Walsworth/pdf/PT_Romalis0704.pdf<BR/> No aether<BR/><BR/>http://fsweb.berry.edu/academic/mans/clane/<BR/>http://physicsweb.org/articles/world/17/3/7<BR/> No Lorentz violation<BR/><BR/>http://www.mazepath.com/uncleal/lajos.htm#a2<BR/> Uncle Al seeks a Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-31741561033562766062007-11-21T20:16:00.000-05:002007-11-21T20:16:00.000-05:00I'm afraid I have to point out one piece of inform...I'm afraid I have to point out one piece of information that I believe to be incorrect. The Torr is still in use -- most high vacuum systems measure the pressure in mTorr. I don't know if that's enough though.d12https://www.blogger.com/profile/07411576202709828334noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-50522697427142769752007-11-21T20:15:00.000-05:002007-11-21T20:15:00.000-05:00If people didn't believe that atmospheric pressure...If people didn't believe that atmospheric pressure was the explanation, then presumably they didn't believe that atmospheric pressure drops with altitude! It's just that the density of the aether up there on the mountain is different, or something......Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47413827870049471932007-11-21T16:52:00.000-05:002007-11-21T16:52:00.000-05:00I am regular reader (and lurker) on your wonderful...I am regular reader (and lurker) on your wonderful blog. This is a really nice writeup. I also liked the discussions of the cosmological constant very much. Thanks.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45044609137578607392007-11-21T16:49:00.000-05:002007-11-21T16:49:00.000-05:00Dear michael,thanks for the nice words! I thought ...Dear michael,<BR/><BR/><BR/>thanks for the nice words! I thought that the story has a few nice twists - the puzzled engineers, a clueless Galileo, experiments with long tubes filled with wine and water, the Pascal wunderkind, an errant Descartes, and finally this kind of expedition on the mountaintop - so the posting had to become a bit longer ;-)<BR/><BR/>That math and science classes are in stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-25128127794534377662007-11-21T16:22:00.000-05:002007-11-21T16:22:00.000-05:00Dear Bee,Isn't it funny how the "emptiness" has fa...Dear Bee,<BR/><BR/><I>Isn't it funny how the "emptiness" has fascinated scientists over the centuries, and the nature of the vacuum is still today subject of vivid discussion? </I><BR/><BR/>that's true, it's really fascinating! But I have to add, it's a funny coincidence that while I was researching this story and preparing the post, you wrote about the Casimir effect and the Cosmological stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-31817000547317485402007-11-21T15:21:00.000-05:002007-11-21T15:21:00.000-05:00A fun and interesting post.It amazes me how they c...A fun and interesting post.<BR/><BR/>It amazes me how they can make math and science so boring in school and then you read something like this; how intigueing it is; you realize how bad our [U.S.A.] education system is.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-62721952028399781872007-11-21T13:13:00.000-05:002007-11-21T13:13:00.000-05:00Dear Stefan,Thanks for this interesting journey! I...Dear Stefan,<BR/><BR/>Thanks for this interesting journey! Isn't it funny how the "emptiness" has fascinated scientists over the centuries, and the nature of the vacuum is still today subject of vivid discussion? Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.com