Talk:Standard cubic foot

I think that this article and the one mentioned below should be mergens in a single Standard reference volume for gasses and all measures such as SCF, Nm3. Sm3 and such should reference to this article — Preceding unsigned comment added by Mortena2510 (talk • contribs) 11:56, 19 March 2016 (UTC) Merge or expand?

The article on volumetric flow (SCFM) is similar but much more complete. Maybe a (partial) merge is possible? —Preceding unsigned comment added by 81.89.193.59 (talk) 11:39, 29 June 2009 (UTC)

MMcf vs Mscf
Text says that MMcf is short for million (or thousand thousand) cubic feet. But it also says that Mscf is short for Million standard cubic feet.

I agree that MMCF is taken as million cubic feet. I have a very difficult time then believing that when you add the "s" for standard cubic feet, M suddenly becomes the indicator for one million, vs. MM as the same indication without the "s". — Preceding unsigned comment added by SlowDave1 (talk • contribs) 22:14, 4 October 2012 (UTC)

Usage of spelling
Why having both "cubic metre" and "cubic meter" in the same article? For the sake of consistency let us have one or the other, but not both. Peter Horn User talk 00:38, 24 September 2014 (UTC) Peter Horn User talk 00:40, 24 September 2014 (UTC)

Conversion factor scf to mol
According to the article, the conversion scf to mol is "straightforward": one standard cubic foot represents 1.19804 moles.

When I try to determine the conversion factor from the ideal gas law by the relation
 * $$n = \frac{PV}{RT},$$

in which $n$ is the number of moles, using
 * $V$ = 1 ft3 = 0.028316846592 m3,
 * $T$ = 21 °C = 294.15 K,
 * $P$ = 101.35 kPa = 1013500 Pa,
 * $R$ = 8.3144598 m3 Pa K−1 mol−1,

I obtain
 * $n$ = 0.85219 mol.

The conversion factor 0.85219 mol/scf is significantly different from 1.19804 mol/scf. --Lambiam 17:56, 17 August 2018 (UTC)

When I repeat the calculation with the "Canadian" definition for natural gas (the link in the given ref is dead), I get 0.83468 mol/scf. And 0.83468−1 = 1.19806. I think we have found the source of the mystery number, and it is totally wrong. I will proceed to delete the offending statement. --Lambiam 18:16, 17 August 2018 (UTC)

Pressure in US definition of Standard cubic foot
From the 2019 publication "Uniform Laws and Regulation" by NIST, it seems the pressure in the US definition for natural gas (petroleum gas) is 101.35 kPa, while the reference "James E. Gallagher (2013). Natural Gas Measurement Handbook" states 101.56 kPa. The value 101.35 kPa was also used in the calculations in Talk entry above "Conversion factor scf to mol".

Is the NIST value newer, and the 14.73 psi value is an historic definition (close to 30 inch of mercury)? Anyone with more information on this topic? Ws1920 (talk) 20:08, 8 December 2019 (UTC)


 * Seems to exist quite a few different definitions. This page have an overview. Ws1920 (talk) 20:56, 10 December 2019 (UTC)

Square cubic foot?
Square cubic foot is used in several sources: Kentucky, US Air Force, journalism. If this is a different concept it needs to be mentioned. If it's just a typo, I don't know if it needs to be mentioned? One vendor says 1 gallon liquid nitrogen makes 90 square cubic feet, which is suspiciously near the 93 factor for standard cubic feet Numbersinstitute (talk) 20:44, 12 December 2023 (UTC)


 * I strongly suspect that 'square cubic foot' is the result of someone seeing 'scf', thinking they know what it stands for, but erroneously expanding it to 'square cubic foot' without realizing that the phrase makes absolutely zero sense. Indefatigable (talk) Indefatigable (talk) 23:31, 13 December 2023 (UTC)