Talk:2,2,4-Trimethylpentane

Question
Are we certain that 2,2,4-trimethylpentane isn't being confused with 2,3,4-trimethylpentane here? I'm no chemist, but presumably 2,3,4-, being more regular in shape, would be a better candidate for octane reference, and that's what I thought was being used as such.


 * No, it definitely is 2,2,4-trimethylpentane. Have a look at this.  Ben 23:13, 22 March 2006 (UTC)

Data table
Why there is no "Octane Number = 100" in the data table? Albmont 14:15, 13 November 2006 (UTC)


 * Because it is important enough to be mentioned in the article text, and we have very little data for octane numbers of other compounds. Physchim62 (talk) 14:36, 13 November 2006 (UTC)


 * So the idea of the table is to include only data that we have for lots of chemicals? If I want, say, the octane rating of toluene, I won't find it by searching toluene, but by searching octane rating? I would like to have in each chemical's page all the information that can be gathered about it :-) Albmont 15:35, 13 November 2006 (UTC)


 * I agree that it should be on the side data table. When I was doing one of my projects, I kept checking for the same octane ratings by looking up the elements themselves, and annoyingly had to look up octane rating. Also, not all autoignition temperatures are in the data table, but we put it up for the ones that we know.  I think that "ocatane rating" should be in the data table. --Theultimatejoeshmo 05:44, 5 December 2006 (UTC)
 * Completely disagree. Octane rating is not a physical or chemical property; it is an arbitrary, empirical scale used primarily by non-chemists. Furthermore, the fraction of people who come to the toluene article looking for octane ratings is essentially zero. The fact that you called a chemical compound an "element" demonstrates that you are not the primary intended audience for the data tables, which would understand the difference. -66.41.19.135 (talk) 03:10, 27 March 2010 (UTC)

"Kinds" of n-heptane?
The article includes the following statement:

"Graham added different kinds and amounts of n-heptane" (emphasis mine)

n-heptane is a pure compound. It comes in one kind. What is the intended meaning of this poorly worded statement? Did the author mean simply to say different isomers of heptane, ? Not clear, and in its current form, meaningless. -66.41.19.135 (talk) 03:11, 27 March 2010 (UTC)
 * Good comment, thank you. I went to the source and edited the article to conform better to it. There's nothing to stop you improving it further. Thanks again. --John (talk) 03:29, 27 March 2010 (UTC)

Why 2,2,4-Trimethylpentane is called as isooctane?This name is very confusing — Preceding unsigned comment added by 124.124.12.233 (talk) 04:16, 12 August 2013 (UTC)

Density
In the Properties section for this chemical (and for many other chemicals), the density of the chemical is given without a corresponding temperature. Since density is a temperature-dependent property, the temperature needs to be specified. Truth is, I now see that this same problem also occurs for some other properties in both the Properties section and the Thermochemistry section. Unless I'm missing it somehow, there doesn't appear to be a "default" or "presumed" temperature given anywhere. JeffSmith2010 (talk) 20:16, 17 July 2015 (UTC)
 * We assume STP. Otherwise all statements get very wordy.  --Smokefoot (talk) 22:00, 17 July 2015 (UTC)

STP is not a good assumption for physical properties data. It really must be stated at a given temperature. — Preceding unsigned comment added by 98.175.76.76 (talk) 01:48, 19 September 2018 (UTC)