Talk:Methane

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VESPR Geometry Problem?

The VESPR diagram on the fact sheet seems to be misleading — as a tetrahedral represented in the manner it is currently would seem to indicate that here is a difference in angle between the four hydrogens (more specificly, the "top" hydrogen with the rest) whereas, realistically, they exhibit uniformally 190º angle. See this image (0 lone pair and steric number 4) for an example of how one may represent it. --jemoka (talk) 9:41, 14 October 2019 (PST)

@Jemoka: Hmm, yeah, it definitely depends on how skilled the reader is at interpreting these diagrams. I'm afraid the link above is broken for me. -- Beland (talk) 07:40, 21 June 2024 (UTC)[reply]

Inconsistent - 2015 to 2019 sharp rise

The figure in sub section Atmospheric methane seems to be inconsistent with this statement in the same sub section:

"From 2015 to 2019 sharp rises in levels of atmospheric methane have been recorded."

The rate of increase seems to have been roughly constant since 2007.

--Mortense (talk) 13:32, 26 July 2019 (UTC)[reply]

@Mortense: The claim is referenced; what source are you looking at to arrive at that conclusion? -- Beland (talk) 07:29, 21 June 2024 (UTC)[reply]

Instability

Wouldn't methane be a 1 on this scale? Similar to Propene?

Normally stable, but can become unstable at elevated temperatures and pressures (e.g. propene) — Preceding unsigned comment added by Jokem (talk • contribs) 02:23, 12 August 2021 (UTC)[reply]

@Jokem: What scale are you referring to? -- Beland (talk) 07:33, 21 June 2024 (UTC)[reply]

I am referring to the fire diamond. Jokem (talk) 02:13, 12 August 2024 (UTC)[reply]

I'm told by a chemist that the reactivity rating on the cited source ([1]) is the same as instability, and that says methane is rated 0 for that. I'm also told propene is different because it will polymerize with elevated temperatures or pressures. -- Beland (talk) 07:31, 12 August 2024 (UTC)[reply]

This is a Global Warming Scare Propaganda

Hardly any useful info just "be scared of cows!" That part should be left out for it belongs to a different article.

I was looking for useful info like workplace safety: maximum allowable ppm in air. Nothing. The scare campaign didn't work. I'm not scared. — Preceding unsigned comment added by 115.70.29.185 (talk) 13:22, 18 June 2025 (UTC)[reply]

There are no exposure limits (ppm) for methane because it is non-toxic. Only health hazard (as with all non-toxic gases) is asphyxiation by displacing oxygen. HertzDonuts (talk) 16:00, 3 September 2025 (UTC)[reply]

Need to find source for this:

Methane off-gas can penetrate the interiors of buildings near landfills and expose occupants to significant levels of methane. Some buildings have specially engineered recovery systems below their basements to actively capture this gas and vent it away from the building. HertzDonuts (talk) 16:38, 4 September 2025 (UTC)[reply]