Talk:Boiling points of the elements (data page)

message: This page is intended as an authoritative data collection with citation of sources, that may be cited as a central reference by other articles (such as for the chemical elements). Femto 20:01, 18 Mar 2005 (UTC)
thread_title: Comment

message: === CRC boiling point for gallium ===
I can't read this myself right now but someone on a science forum reported to me the value is 2403°C, whereas Jdrewitt reports here that the CRC handbook's later editions list a value of "2204 degrees C (2477 K)". In that same discussion ChrisHodgesUK reports that the 66th and earlier editions give "2403°C".
It would be interesting to learn why the CRC Handbook editors changed this value, what their sources were, but meantime I think Wikipedia is correct to list the value from the most recent editions as the "CRC value" in the table in the page under discussion here.
Peter Dow (talk) 00:12, 12 November 2010 (UTC)
thread_title:  31 Ga gallium 

message: I can't read this myself right now but someone on a science forum reported to me the value is 2403°C, whereas Jdrewitt reports here that the CRC handbook's later editions list a value of "2204 degrees C (2477 K)". In that same discussion ChrisHodgesUK reports that the 66th and earlier editions give "2403°C".
It would be interesting to learn why the CRC Handbook editors changed this value, what their sources were, but meantime I think Wikipedia is correct to list the value from the most recent editions as the "CRC value" in the table in the page under discussion here.
Peter Dow (talk) 00:12, 12 November 2010 (UTC)
thread_title:  CRC boiling point for gallium 

message: The "WEL" is quoting the Webelements.com value or 2477 [or 2204 °C (3999 °F)] K faithfully. However, we are told on this page that the webelements.com website takes its values in turn from two sources - (1) James & Lord and (2) Kaye & Laby  —Preceding unsigned comment added by Peter Dow (talk • contribs) 19:25, 10 November 2010 (UTC)
thread_title:  WEL boiling point for gallium 

message: I am proposing to list a number of suggestions and I invite discussion on each.
=== Superheating of the liquid ===
We know that gallium supercools readily so why cannot it also superheat? Perhaps experimenters are in too much of a hurry to measure the boiling temperature and keep raising the temperature too quickly without waiting for the superheated liquid to boil which it will do eventually at a lower temperature?
=== Differences in pressure ===
If anything genuinely changes a boiling point temperature it is pressure. Perhaps experiments have not taken care to ensure the heated liquid is under standard pressure conditions?
=== Simple experimental error ===
Temperature measuring devices may have been wrongly calibrated or misread?
=== Chemical contamination of the sample ===
Gallium is considered to be very reactive at high temperature. Perhaps the samples are reacting with the vessel and the contaminants are modifying the boiling temperature?
=== Estimated not measured boiling points ===
The various values quoted may not all be direct measurements of the boiling points but may have been estimated by extrapolating from lower temperature vapour pressures. Similar sources of error as suggested above arise in measuring the lower temperature vapour pressures and in addition further variability could arise from different extrapolation and estimation methods. 
Peter Dow (talk) 18:19, 13 November 2010 (UTC)
thread_title:  Suggestions as to why measured boiling points vary so much 

message: The various values quoted may not all be direct measurements of the boiling points but may have been estimated by extrapolating from lower temperature vapour pressures. Similar sources of error as suggested above arise in measuring the lower temperature vapour pressures and in addition further variability could arise from different extrapolation and estimation methods. 
Peter Dow (talk) 18:19, 13 November 2010 (UTC)
thread_title:  Estimated not measured boiling points 

message: * http://www.silicon-wafers.com/msds among other reliable sources lists 2355C as the correct value. This is significantly lower than the currently listed number. Anyone have a reliable source for the higher value?
Nmesisgeek (talk) 18:51, 28 August 2011 (UTC)
thread_title:  Silicon