Standard-state pressure = 100 000 Pa
- Symbol
- p°
- Value
- 100 000
- Unit
- Pa
- Uncertainty
- exact (by definition)
- Copy-ready
100000
Exactly 1 bar — the thermodynamic reference pressure, and deliberately not the same thing as 1 atm.
NIST, Fundamental Physical Constants — Complete Listing (2022 CODATA adjustment), retrieved 2026-07-26.
Practical reference values
Link to or cite this value
Link from a web page
Plain HTML. Works in any CMS, LMS or course page that accepts markup.
<a href="https://usephysics.com/reference/standard-state-pressure">Standard-state pressure — 100 000 Pa — UsePhysics</a>
Link from Markdown
For READMEs, wikis, Notion, Obsidian and static-site notes.
[Standard-state pressure — 100 000 Pa — UsePhysics](https://usephysics.com/reference/standard-state-pressure)
Cite it in a document
Replace [date] with the date you consulted the page. The constants themselves should be cited to NIST/CODATA — the line below does that for you.
UsePhysics. "Standard-state pressure — 100 000 Pa." UsePhysics.com. https://usephysics.com/reference/standard-state-pressure. Value from the 2022 CODATA adjustment (NIST). Accessed [date].