Talk:Cubic equations of state

Problems in the section Peng-Robinson-Babalola equation of state (PRB) and some other places
1. The equation appears to use different variable notation conventions than the others in the article without explanation (is P = p or is P = p[r]? and is v = V[m]?) (The section Cubic-Plus-Association and some minor smatterings (namely upper vs. lower case p) throughout the article also have this problem it seems.)

2. The PRB section ends with a truncated sentence fragment, like the author was cut off in mid-sentence with more to say.

3. There is no source for the alleged goals of the equation in Peng-Robinson. — Preceding unsigned comment added by 201.39.147.24 (talk) 19:55, 18 November 2023 (UTC)

--RProgrammer (talk) 19:11, 13 April 2022 (UTC)


 * Good points, I will have a look. The entire article needs work on notation. I am thinking that we should use upper case for all pressures throughout the entire article since this is already the case for temperatures and molar volumes. Qflib, aka KeeYou Flib (talk) 18:25, 20 April 2022 (UTC)
 * On second thought, it will be better if $$P_r$$ is used for (dimensionless) relative pressures and $$p$$ is used for absolute pressures, given how the article evolves. I'll work on that. Qflib, aka KeeYou Flib (talk) 13:42, 21 April 2022 (UTC)
 * I've edited the first two sections with this notation. I'm going to pause editing here so that if anyone has an objection to the notation, you can speak now. After a few days, I'll continue working my way down the article. In addition to notational edits I am also trying to improve the language and flow. Qflib, aka KeeYou Flib (talk) 14:12, 21 April 2022 (UTC)

Why are there non-cubic equations of state on this page?
It seems like there's been a number of equations of state added to this page that are not, in fact, cubic functions of the molar volume. Those probably belong in the equation of state page or, if they are significant enough, on their own pages. I think that they should be removed but I want to hear what others think. I don't want to remove other people's edits unless it's necessary but it just seems like this page has a particular focus which is being interrupted. Open to other's thoiughts on the subject. Qflib (talk) 05:54, 17 February 2024 (UTC)


 * I should have been more specific. Is the Elliott–Suresh–Donohue equation a cubic equation? Because it doesn't look like one from here. Qflib (talk) 05:56, 17 February 2024 (UTC)