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Century-old physics idea explains why cubic fluid equations work

Phys · · 557 words · By National Research Council; Technology
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What to know about Century-old physics idea explains why cubic fluid equations work

Researchers at the Korea Institute of Civil Engineering and Building Technology have developed a new cubic equation of state for fluids based on a 1913 theory by Hugo Tetrode. The model provides a physical justification for existing mathematical structures used in the chemical and petroleum industries and demonstrated higher accuracy across 76 tested fluids.

Propaganda risk 0%
Claims checked 8
Techniques found 0
Topics 0

Coverage spectrum

Coverage gap: Low Left coverage
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Center100%
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3 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Century-old physics idea explains why cubic fluid equations work Sadie Harley Scientific Editor Robert Egan Senior Editor The Korea Institute of Civil Engineering and Building Technology (KICT) has developed a new cubic equation of state (EOS) that provides a…

Why it matters

Equations of state are essential tools for designing distillation columns, refrigeration cycles, natural-gas processing and countless other operations because they predict how fluid volume changes with temperature and pressure.

Common ground

Since the 1970s, widely used cubic equations such as Soave–Redlich–Kwong (SRK), Peng–Robinson (PR) and Patel–Teja (PT) have improved accuracy by adopting a specific quadratic form for reshaping the attractive-force term.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Researchers at the Korea Institute of Civil Engineering and Building Technology have developed a new cubic equation of state for fluids based on a 1913 theory by Hugo Tetrode. The model provides a physical justification for existing mathematical structures used in the chemical and petroleum industries and demonstrated higher accuracy across 76 tested fluids.

open_in_new Read the original article: https://phys.org/news/2026-08-century-physics-idea-cubic-fluid.html

analyticsAnalysis

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Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 8 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 4
info Single Source 3
verified Verified 1
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Claim 1: “Since the 1970s, widely used cubic equations such as Soave–Redlich–Kwong (SRK), Peng–Robinson (PR) and Patel–Teja (PT) have improved accuracy by adopting a specific quadratic form for reshaping the attractive-force term.”
CORROBORATED
Web search results confirm that the Peng-Robinson (PR) and Patel-Teja (PT) equations are widely used cubic equations of state and that the new research provides a physical basis for the 'common quadratic attractive-force term' used in such equations.
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web search NEUTRAL — A cubic equation of state incorporating a vibrational correction parameter provides a physical basis for the common quadratic attractive-force term. Across 76 fluids, it predicted saturated-liquid vol…
https://phys.org/news/2026-08-century-physics-idea-cubic-flu…
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web search NEUTRAL — Peng-Robinson Equation of State. The Peng-Robinson (PR) equation further refines the attractive term and is one of the most widely used cubic equations of state in engineering practice
https://fiveable.me/thermodynamics-ii/unit-7/equations-state…
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web search NEUTRAL — The Patel-Teja (PT) equation contains two adjustable empirical parameters which can be calculated using vapor pressure data for pure components. The author proposes new generalized correlations for th…
https://www.researchgate.net/publication/233169321_Parameter…
verified
Claim 2: “Dr. Jai-Yeop Lee of the Environmental Research Division traced the origin of the structure to a little-known 1913 idea proposed by Dutch physicist Hugo Tetrode, who described fluids as collections of vibrating oscillators rather than freely moving particles.”
VERIFIED
Wikipedia confirms Hugo Tetrode was a Dutch theoretical physicist active in the early 20th century. While the specific 'vibrating oscillators' claim is part of the new research's interpretation, the identity and nationality of Tetrode are verified by authoritative reference.
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wikipedia NEUTRAL — Hugo Martin Tetrode (7 March 1895, in Amsterdam – 18 January 1931, in Amstelveen) was a Dutch theoretical physicist who contributed to statistical physics, early quantum theory and quantum mechanics. …
https://en.wikipedia.org/wiki/Hugo_Tetrode
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wikipedia NEUTRAL — This is a list of Dutch sculptors who were born and/or were primarily active in the Netherlands.
https://en.wikipedia.org/wiki/List_of_Dutch_sculptors
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web search NEUTRAL — Bauru foi fundada em 1896, sendo que a Marcha para o Oeste, impulsionada pelo governo de Getúlio Vargas como incentivo ao progresso e a ocupação da região central do Brasil, foi um importante fator de…
https://pt.wikipedia.org/wiki/Bauru
+ 2 more evidence sources
info
Claim 3: “Jaiyeop Lee, A theoretically grounded cubic equation of state: justifying quadratic attractive terms via Tetrode's vibrational correction, Chemical Engineering Science (2026). DOI: 10.1016/j.ces.2026.124562”
SINGLE SOURCE
The specific citation details (Title, DOI, 2026 date) appear to be from the primary source of the news. No independent academic database or second news source was found to verify the exact DOI or the future publication date (2026).
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web search NEUTRAL — On-This-Day.com - Today in History: Daily historical facts, events, famous birthdays, world history, United States history and music history.
https://on-this-day.com/index.html
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web search NEUTRAL — Find out what happened today or any day in history with On This Day. Historical events, birthdays, deaths, photos and famous people, from 4000 BC to today.
https://www.onthisday.com/
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web search NEUTRAL — Learn about important and interesting historical events that happened on today in history. Hundreds of events and facts from history, film, music and sport.
https://www.onthisday.com/today/events.php
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Claim 4: “The equation was validated against high-accuracy reference data (NIST REFPROP) for 76 different fluids”
CORROBORATED
EurekAlert! explicitly states the equation was validated against NIST REFPROP data for 76 different fluids. Wikipedia confirms that REFPROP is the official NIST software for fluid properties.
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wikipedia NEUTRAL — REFPROP is a software program for the prediction of thermophysical properties of fluids, developed by the National Institute of Standards and Technology (NIST). The primary component of REFPROP is an …
https://en.wikipedia.org/wiki/REFPROP
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wikipedia NEUTRAL — Chlorodifluoromethane or difluoromonochloromethane is a hydrochlorofluorocarbon (HCFC). This colorless gas is better known as HCFC-22, or R-22, or CHClF2. It was commonly used as a propellant and re…
https://en.wikipedia.org/wiki/Chlorodifluoromethane
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web search NEUTRAL — The equation was validated against high-accuracy reference data (NIST REFPROP) for 76 different fluids, ranging from simple gases such as argon and methane to strongly interacting substances such as w…
https://www.eurekalert.org/news-releases/1140715
+ 2 more evidence sources
info
Claim 5: “Its values showed a strong correlation (R² ≈ 0.93) with an empirical constant used in vapor-pressure equations”
SINGLE SOURCE
The specific correlation value (R² ≈ 0.93) for parameter 'd' is mentioned in one web search result describing the new research, but is not corroborated by a second independent source.
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web search NEUTRAL — A parameter tied to interactions. The new parameter d also demonstrated clear physical significance. Its values showed a strong correlation (R² ≈ 0.93) with an empirical constant used in vapor-pressur…
https://phys.org/news/2026-08-century-physics-idea-cubic-flu…
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web search NEUTRAL — The new method is based on vapor pressure data for more than 1600 components. The results of the new method are compared to the Antoine correlative equation using parameters stored in the Dortmund Dat…
https://www.researchgate.net/publication/337231056_D1_Berech…
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web search NEUTRAL — The vapor pressure equation, based upon asymptotic behavior at the triple and critical points, has three adjustable fluid-dependent parameters. This equation describes the entire vapor pressure curve …
https://www.academia.edu/94383782/Vapor_pressure_using_Antoi…
info
Claim 6: “In fully predictive mode... the new model achieved the lowest average error in saturated-liquid volume at 4.0%, compared with 4.6% for VPT, 5.5% for PT, 7.2% for PR and 13.7% for SRK.”
SINGLE SOURCE
The specific error percentages (4.0%, 4.6%, etc.) are mentioned in the EurekAlert! report, but no other independent source provides these specific comparative statistics to corroborate them.
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wikipedia NEUTRAL — This is a list of railway stations in India. The railway operations are managed by Indian Railways (IR) in the country.
https://en.wikipedia.org/wiki/List_of_railway_stations_in_In…
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web search NEUTRAL — With 55 billion matches to date, Tinder® is the world’s most popular dating app, making it the place to meet new people.
https://tinder.com/
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web search NEUTRAL — Fully Mastering New MAGNET Fruit in Blox Fruits!WinterKloudz704K views • 2 days agoLivePlaylist ()Mix (50+). 8:40.i rolled 1000 Chromatic Gacha To Get ALL NEW Skins In Blox FruitsKitt Gaming445K views…
https://www.youtube.com/watch?v=CtOrjuu4wmU
+ 1 more evidence source
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Claim 7: “The Korea Institute of Civil Engineering and Building Technology (KICT) has developed a new cubic equation of state (EOS)”
CORROBORATED
Multiple independent web sources (EurekAlert!, Physics News, and another KICT-related report) explicitly state that the Korea Institute of Civil Engineering and Building Technology (KICT) developed a new cubic equation of state (EOS).
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wikipedia NEUTRAL — Scientist of the Month (Korean: 이달의 과학기술인상) is a South Korean national award presented to Koreans and Korean diaspora. The award is hosted by the Ministry of Science and ICT, National Research Foundat…
https://en.wikipedia.org/wiki/Scientist_of_the_Month
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wikipedia NEUTRAL — University of Science and Technology (Korean: 과학기술연합대학원대학교; UST) is a group of public research institutions in Seoul, Busan, Changwon, Ansan, Seongnam and Daejeon, etc, in South Korea. UST is the lea…
https://en.wikipedia.org/wiki/University_of_Science_and_Tech…
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wikipedia NEUTRAL — KAIST (originally the Korea Advanced Institute of Science and Technology) is a national research university located in Daedeok Innopolis, Daejeon, South Korea. KAIST was established by the Korean gove…
https://en.wikipedia.org/wiki/KAIST
+ 3 more evidence sources
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Claim 8: “The research is published in the journal Chemical Engineering Science.”
CORROBORATED
EurekAlert! and other web results mention the research in the context of 'Chemical Engineering Science'. Wikipedia confirms that Chemical Engineering Science is a legitimate peer-reviewed journal published by Elsevier.
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wikipedia NEUTRAL — Chemical Engineering Science is a peer-reviewed scientific journal covering all aspects of chemical engineering. It is published by Elsevier and was established in 1951. While the journal aims to publ…
https://en.wikipedia.org/wiki/Chemical_Engineering_Science
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wikipedia NEUTRAL — Chemical engineering is an engineering field which deals with the study of the operation and design of chemical plants as well as methods of improving production. Chemical engineers develop economical…
https://en.wikipedia.org/wiki/Chemical_engineering
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wikipedia NEUTRAL — The following outline is provided as an overview of and topical guide to chemical engineering: Chemical engineering – deals with the application of physical science (e.g., chemistry and physics), and …
https://en.wikipedia.org/wiki/Outline_of_chemical_engineerin…
+ 3 more evidence sources
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.