AllChemicals — The Online Chemical Glossary | https://allchemicals.info/chemical/721-standard-conditions
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AllChemicals Editorial Team
Quick Reference
Also Known As
STP, standard state, standard temperature and pressure, SATP
What is Standard Conditions?
Reference conditions used for comparing thermodynamic quantities: 298 K (25°C), 1 bar (100 kPa) pressure, and 1 M for solutions. Standard state thermodynamic quantities are denoted with a ° superscript (ΔH°, ΔG°, E°). Note: STP (Standard Temperature and Pressure) uses 0°C and 1 atm.
Properties & Characteristics
Standard conditions refer to a defined set of conditions used for reporting and comparing thermodynamic and chemical data. Standard temperature and pressure (STP) is defined by IUPAC as 0°C (273.15 K) and 100 kPa. Standard state for thermodynamic purposes is 25°C (298.15 K) and 1 bar (100 kPa). Standard conditions allow meaningful comparison of data across different laboratories.
Uses & Applications
Standard conditions are used to report standard enthalpies, entropies, and Gibbs energies. Gas volume calculations at STP are used in stoichiometry involving gaseous reactants or products. Standard electrode potentials are defined at standard conditions.
Safety Information
Standard conditions are reference conditions for data. Actual experimental conditions may differ significantly, and safety considerations must be applied to the actual conditions used.
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
SynonymsSTP, standard state, standard temperature and pressure, SATP
Frequently Asked Questions
Reference conditions used for comparing thermodynamic quantities: 298 K (25°C), 1 bar (100 kPa) pressure, and 1 M for solutions. Standard state thermodynamic quantities are denoted with a ° superscript (ΔH°, ΔG°, E°). Note: STP (Standard Temperature and Pressure) uses 0°C and 1 atm.
Standard conditions are used to report standard enthalpies, entropies, and Gibbs energies. Gas volume calculations at STP are used in stoichiometry involving gaseous reactants or products. Standard electrode potentials are defined at standard conditions.
Standard conditions are reference conditions for data. Actual experimental conditions may differ significantly, and safety considerations must be applied to the actual conditions used.
Editorial standards: Chemical data is sourced from peer-reviewed literature,
CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA,
and IAEA. For educational purposes only — always consult official SDS documentation and qualified
professionals before handling chemicals.
