Talk:Vacuum flask
From Wikipedia, the free encyclopedia
 | This article is rated C-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||
| ||||||||||||||||||
.jpg){kind=small}
A good Thermos resource link
Thermosonline.com seems to cover a wide range of Thermos items and articles and would be a good link resource for readers.65.15.55.107 15:12, 27 March 2006 (UTC)
Perfect insulation?
I removed the following paragraph
- In theory, a vacuum flask could therefore approach arbitrarily close to perfectly insulating fh, for example keeping a cup of coffee hot for a decade. In practice, however, the inside wall of the container must meet the outside wall, usually at the mouth of the container, at which point slight heat conduction does occur between the inside and outside walls (the vacuum being in between).
since I think it is misleading. While conduction is the primary route of heat loss for most materials, radiation is also important. I can't imagine decade-scale insulation, since heat would necessarily be lost through radiation. Thoughts? --TeaDrinker 19:53, 13 November 2006 (UTC)
- Sounds like you were correct to remove it. 62.220.237.74 (talk) 21:19, 22 November 2007 (UTC)
- Yes, it's always important to get "consensus" from anonymous sources. That's how science is done in the contemporary political climate. Phhhht! —QuicksilverT @ 16:11, 2 April 2009 (UTC
Radiation is a factor but is minuscule because of the shiny coatings. Decades, no, but it does transfer more heat from the conduction at the neck than anyway else.
Vacuum flask was invented by Adolf Ferdinand Weinhold
Already in 1881 Adolf Ferdinand Weinhold published a book in which he described a vacuum flask, similar to the "Dewar flask", for use in the laboratory. Only 10 years later did Dewar invent the flask for a second time. Should be mentioned. --129.13.186.4 (talk) 14:27, 26 January 2008 (UTC)
Surface Area
Should the low surface-area:volume ratio of the inner flask be mentioned? (i.e. that it minimizes heat transfer) —Preceding unsigned comment added by LaFoiblesse (talk • contribs) 20:49, 14 February 2008 (UTC)
- No, surface-area:volume ratio is not relevant. The flask of any shape inside that has double walls with nearly vacuum in between will be therefore still a Dewar flask. There are different ways to reduce heat dissipation; one of them (double walls with vacuum in between) is the topic of this article. Other strategies (reducing of the surface-area:volume ratio, additional heating/cooling of the outer walls, etc.) can be used, but they are not the topic of this article. Adams13 (talk) 12:32, 23 January 2013 (UTC)
Could anyone please supply a photo for the domestic variant? :)
I can only see the industrial variant for liquid oxygen or nitrogen, which -- no doubt -- would not have much importance in everyday life. :) -andy
- You mean like making liquid nitrogen ice cream?
- I saw them "cook" with liquid nitrogen on Iron Chef. Perhaps a picture of that, if we can obtain the rights?
- The most popular everyday domestic use of liquid nitrogen, I believe, is freezing random objects and smashing them.
92.230.13.101 (talk) 22:24, 28 October 2008 (UTC)
Start-class
Not sure why this article is labelled start-class. I looked it up and found all the information I wanted (and more). --Martin Wyatt 20:16, 19 March 2011 (UTC) — Preceding unsigned comment added by MWLittleGuy (talk • contribs)