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HandWiki. Standard Conditions for Temperature and Pressure. Encyclopedia. Available online: https://encyclopedia.pub/entry/33636 (accessed on 20 September 2026).
HandWiki. Standard Conditions for Temperature and Pressure. Encyclopedia. Available at: https://encyclopedia.pub/entry/33636. Accessed September 20, 2026.
HandWiki. "Standard Conditions for Temperature and Pressure" Encyclopedia, https://encyclopedia.pub/entry/33636 (accessed September 20, 2026).
HandWiki. (2022, November 09). Standard Conditions for Temperature and Pressure. In Encyclopedia. https://encyclopedia.pub/entry/33636
HandWiki. "Standard Conditions for Temperature and Pressure." Encyclopedia. Web. 09 November, 2022.
Standard Conditions for Temperature and Pressure
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The content is sourced from: https://handwiki.org/wiki/Standard_conditions_for_temperature_and_pressure

Standard temperature and pressure (STP) are standard sets of conditions for experimental measurements to be established to allow comparisons to be made between different sets of data. The most used standards are those of the International Union of Pure and Applied Chemistry (IUPAC) and the National Institute of Standards and Technology (NIST), although these are not universally accepted standards. Other organizations have established a variety of alternative definitions for their standard reference conditions. In chemistry, IUPAC changed the definition of standard temperature and pressure in 1982: STP should not be confused with the standard state commonly used in thermodynamic evaluations of the Gibbs energy of a reaction. NIST uses a temperature of 20 °C (293.15 K, 68 °F) and an absolute pressure of 1 atm (14.696 psi, 101.325 kPa). This standard is also called normal temperature and pressure (abbreviated as NTP). These stated values of STP used by NIST have not been verified and require a source. However, values cited in Modern Thermodynamics with Statistical Mechanics by Carl S. Helrich and A Guide to the NIST Chemistry WebBook by Peter J. Linstrom suggest a common STP in use by NIST for thermodynamic experiments is 298.15 K (25°C, 77°F) and 1 bar (14.5038 psi, 100 kPa). The International Standard Metric Conditions for natural gas and similar fluids are 288.15 K (15.00 °C; 59.00 °F) and 101.325 kPa. In industry and commerce, standard conditions for temperature and pressure are often necessary to define the standard reference conditions to express the volumes of gases and liquids and related quantities such as the rate of volumetric flow (the volumes of gases vary significantly with temperature and pressure): standard cubic meters per second (Sm3/s), and normal cubic meters per second (Nm3/s). However, many technical publications (books, journals, advertisements for equipment and machinery) simply state "standard conditions" without specifying them; often substituting the term with older "normal conditions", or "NC". In special cases this can lead to confusion and errors. Good practice always incorporates the reference conditions of temperature and pressure. If not stated, some room environment conditions are supposed, close to 1 atm pressure, 293 K (20 °C), and 0% humidity.

normal temperature natural gas standard temperature

References

  1. Doiron, Ted (Jan–Feb 2007). "20 °C – A Short History of the Standard Reference Temperature for Industrial Dimensional Measurements". Journal of Research of the National Institute of Standards and Technology 112 (1): 1–23. doi:10.6028/jres.112.001. PMID 27110451.  http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4654601
  2. A. D. McNaught and A. Wilkinson (1997). IUPAC. Compendium of Chemical Terminology (2nd ed.). Oxford: Blackwell Scientific Publications. doi:10.1351/goldbook.S05921. ISBN 978-0-9678550-9-7.  https://dx.doi.org/10.1351%2Fgoldbook.S05921
  3. Cohen, Joel E.; Small, Christopher (November 24, 1998). "Hypsographic demography: The distribution of human population by altitude". Proceedings of the National Academy of Sciences 95 (24): 14009–14014. doi:10.1073/pnas.95.24.14009. PMID 9826643.  http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=24316
  4. Gassco. "Concepts – Standard cubic meter (scm)". http://www.gassco.no/sw3138.asp. "Scm: The usual abbreviation for standard cubic metre – a cubic metre of gas under a standard condition, defined as an atmospheric pressure of 1.01325 bar and a temperature of 15°C. This unit provides a measure for gas volume." 
  5. Nord Stream (October 2007). "Status of the Nord Stream pipeline route in the Baltic Sea". http://www.nord-stream.com/uploads/media/Nord_Stream_Route_Status_ENGLISH.pdf. "bcm: Billion Cubic Meter (standard cubic metre – a cubic metre of gas under a standard condition, defined as an atmospheric pressure of 1 atm and a temperature of 15 °C.)" 
  6. Metrogas (June 2004). "Natural gas purchase and sale agreement". http://www.secinfo.com/dsD7y.1a.7.htm. "Natural gas at standard condition shall mean the quantity of natural gas, which at a temperature of fifteen (15) Celsius degrees and a pressure of 101.325 kilopascals occupies the volume of one (1) cubic meter." 
  7. A. D. McNaught and A. Wilkinson (1997). Nič, Miloslav; Jirát, Jiří; Košata, Bedřich et al.. eds. IUPAC. Compendium of Chemical Terminology (2nd ed.). Oxford: Blackwell Scientific Publications. p. 54. doi:10.1351/goldbook. ISBN 0-632-03583-8. https://dev.goldbook.iupac.org/files/pdf/green_book_2ed.pdf#page=62. "Standard conditions for gases: ... and pressure of 105 pascals. The previous standard absolute pressure of 1 atm (equivalent to 101.325 kPa) was changed to 100 kPa in 1982. IUPAC recommends that the former pressure should be discontinued." 
  8. Natural gas – Standard reference conditions (ISO 13443). Geneva, Switzerland: International Organization for Standardization. 1996. http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=20461. 
  9. Robert C. Weast (Editor) (1975). Handbook of Physics and Chemistry (56th ed.). CRC Press. pp. F201–F206. ISBN 978-0-87819-455-1. 
  10. (PDF) Extraction, First Treatment and Loading of Liquid & Gaseous Fossil Fuels (Emission Inventory Guidebook B521, Activities 050201 – 050303). Copenhagen, Denmark: European Environmental Agency. September 1999. https://www.eea.europa.eu/publications/EMEPCORINAIR3/B521vs3.1.pdf/view. 
  11. "Electricity and Gas Inspection Act", SOR/86-131 (defines a set of standard conditions for Imperial units and a different set for metric units)  Canadian Laws. https://web.archive.org/web/20050103235031/http://laws.justice.gc.ca/en/E-4/SOR-86-131/95708.html
  12. "Standards of Performance for New Sources", 40 CFR—Protection of the Environment, Chapter I, Part 60, Section 60.2, 1990  New Source Performance Standards. https://www.afsinc.org/new-source-performance-standards
  13. Wright, J. D.; Johnson, A. N.; Moldover, M. R. (2003). "Design and Uncertainty for a PVTt Gas Flow Standard". Journal of Research of the National Institute of Standards and Technology 108 (1): 21–47. doi:10.6028/jres.108.004. PMID 27413592. PMC 4844527. http://www.cstl.nist.gov/div836/836.01/PDFs/2003/j80wri.pdf. 
  14. "What is the difference between STP and NTP?". http://socratic.org/questions/what-is-the-difference-between-stp-and-ntp. 
  15. Almond, Peter R.; Biggs, Peter J.; Coursey, B. M.; Hanson, W. F.; Huq, M. Saiful; Nath, Ravinder; Rogers, D. W. O. (1999). "AAPM's TG-51 protocol for clinical reference dosimetry of high-energy photon and electron beams". Medical Physics 26 (9): 1847–1870. doi:10.1118/1.598691. PMID 10505874. Bibcode: 1999MedPh..26.1847A. https://semanticscholar.org/paper/aa84780661d3a47cf12baec91751ef38c26e1bfe. 
  16. "National Primary and Secondary Ambient Air Quality Standards", 40 CFR—Protection of the Environment, Chapter I, Part 50, Section 50.3, 1998  National Ambient Air Standards. https://www.britannica.com/science/National-Ambient-Air-Quality-Standards-United-States
  17. "Glossary". Cleveland, OH, USA: Compressed Air and Gas Institute. 2002. http://www.cagi.org/toolbox/glossary.htm. 
  18. "The SI Metric System of Units and SPE Metric Standard (1982)". Society of Petroleum Engineers. Standard Temperature (Page 24), and Notes for Table 2.3, (on PDF page 25 of 42 PDF pages), define two different sets of reference conditions, one for the standard cubic foot and one for the standard cubic meter. https://www.spe.org/authors/docs/metric_standard.pdf. 
  19. Air Intake Filters (ISO 5011:2002). Geneva, Switzerland: International Organization for Standardization. 2002. http://www.iso.org/iso/en/prods-services/ISOstore/store.html. 
  20. "Storage and Handling of Liquefied Petroleum Gases" and "Storage and Handling of Anhydrous Ammonia", 29 CFR—Labor, Chapter XVII—Occupational Safety and Health Administration, Part 1910, Sect. 1910.110 and 1910.111, 1993  Storage/Handling of LPG. https://web.archive.org/web/20060719085519/http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=f169acd0f57a17565c9984fa0f57d285&rgn=div8&view=text&node=29%3A5.1.1.1.8.8.33.10&idno=29
  21. "Rule 102, Definition of Terms (Standard Conditions)", Amended December 2004, South Coast Air Quality Management District, Los Angeles, California, USA  SCAQMD Rule 102 http://www.aqmd.gov/
  22. "49 C.F.R. § 171". https://www.ecfr.gov/cgi-bin/text-idx?SID=4cb9c4fbd569caade0b61e28dec528f2&mc=true&node=se49.2.171_18&rgn=div8. 
  23. Sierra Bullets. "Chapter 3 – Effects of Altitude and Atmospheric Conditions (Exterior Ballistics Section)". Rifle and Handgun Reloading Manual (5 ed.). Sedalia, MO, USA. http://www.exteriorballistics.com/ebexplained/5th/31.cfm. Retrieved 2006-02-03. 
  24. The pressure is specified as 750 mmHg. However, the mmHg is temperature-dependent, since mercury expands as temperature goes up. Here the values for the 0–20 °C range are given.
  25. Gas turbines – Acceptance tests (ISO 2314:1989) (2 ed.). Geneva, Switzerland: International Organization for Standardization. 1989. http://www.iso.org/iso/en/prods-services/ISOstore/store.html. 
  26. Gas turbines – Procurement – Part 2: Standard reference conditions and ratings (ISO 3977-2:1997). Geneva, Switzerland: International Organization for Standardization. 1997. http://www.iso.org/iso/en/prods-services/ISOstore/store.html. 
  27. ANSI/AMCA Standard 210, "Laboratory Methods Of Testing Fans for Aerodynamic Performance Rating", as implied by http://www.greenheck.com/pdf/centrifugal/Plug.pdf when accessed on October 17, 2007. http://www.greenheck.com/pdf/centrifugal/Plug.pdf
  28. The standard is given as 29.92 inHg at an unspecified temperature. This most likely corresponds to a standard pressure of 101.325 kPa, converted into ~29.921 inHg at 32 °F (0 °C).
  29. Association, Compressed Gas (2012-12-06). Compressed Gas Handbook. ISBN 9781461306733. https://books.google.com/books?id=5EfhBwAAQBAJ&q=%22compressed+gas+association%22+handbook+fifth+edition. Retrieved 22 Nov 2017. 
  30. "Chapter 3, Principles of Flight". Pilot's Handbook of Aeronautical Knowledge. Federal Aviation Administration. https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/. 
  31. Air Conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling. UK: BSI EN. 2013. https://shop.bsigroup.com/ProductDetail/?pid=000000000030271396. 
  32. Standard Atmosphere. Geneva, Switzerland: International Organization for Standardization. 1975. https://www.iso.org/standard/7472.html. 
  33. Natural gas - Standard reference conditions. Geneva, Switzerland: International Organization for Standardization. 1996. https://www.iso.org/standard/20461.html. 
  34. Gas analysis - Vocabulary. Geneva, Switzerland: International Organization for Standardization. 2015. https://www.iso.org/standard/53596.html. 
  35. Referenzzustand, Normzustand, Normvolumen; Begriffe und Werte. Germany: Deutsches Institut für Normung. 1990. https://www.din.de/en/getting-involved/standards-committees/natg/standards/wdc-beuth:din21:1505240. 
  36. Peter Gribbon (2001). Excel HSC Chemistry Pocket Book Years 11–12. Pascal Press. ISBN 978-1-74020-303-6. 
  37. "Fundamental Physical Properties: Molar Volumes (CODATA values for ideal gases)". NIST. http://physics.nist.gov/cgi-bin/cuu/Results?search_for=volume+molar. 
  38. U.S. Standard Atmosphere, 1976, U.S. Government Printing Office, Washington, D.C., 1976. https://www.ngdc.noaa.gov/stp/space-weather/online-publications/miscellaneous/us-standard-atmosphere-1976/us-standard-atmosphere_st76-1562_noaa.pdf
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