Skip to content
EvidenceHelixEvidenceLib · Scientific Encyclopedia
⌘ K

Scientific library

EvidenceLib encyclopediaAll articles A–Z2,100Open textbooks35Open-access articles1,010Cancer study catalog458How it is made

My workspace this browser

Saved pages0Notes & annotations0

Recently viewed

Explore by field

Cancer and Oncology182Genetics and Genomics170Neuroscience185Cardiovascular Medicine180Immunology162Pharmacology174Molecular Biology161Infectious Diseases150Rare and Inherited Diseases181Clinical Research173Anatomy and Physiology617Drugs and Chemicals621Psychiatry and Psychology75Public Health and Nutrition64Diagnostics and Medical Technology15
Plans & pricingCompare EvidenceHelix workspace plans
Library›Open textbooks›Chemistry 2e›Fundamental Physical Constants

Continue where you left off ()

Explore more with EvidenceHelix Workspace

Compare studies, analyze evidence and create research reports with premium tools.

Explore Researcher plans

Chemistry 2e · Front matter

Fundamental Physical Constants

CC BY 4.0 · OpenStax · approximately 1 min read

Learning objectives

Fundamental Physical Constants
Name and Symbol Value
atomic mass unit (amu) 1.6605402 × 10−27 kg
Avogadro’s number 6.02214076 × 1023 mol−1
Boltzmann’s constant (k) 1.380649 × 10−23 J K−1
charge-to-mass ratio for electron (e/me) 1.75881962 × 1011 C kg−1
fundamental unit of charge (e) 1.602176634 × 10−19 C
electron rest mass (me) 9.1093897 × 10−31 kg
Faraday’s constant (F) 9.6485309 × 104 C mol−1
gas constant (R) 8.205784 × 10−2 L atm mol−1 K−1 = 8.314510 J mol−1 K−1
molar volume of an ideal gas, 1 atm, 0 °C 22.41409 L mol–1
molar volume of an ideal gas, 1 bar, 0 °C 22.71108 L mol–1
neutron rest mass (mn) 1.6749274 × 10−27 kg
Planck’s constant (h) 6.62607015 × 10−34 J s
proton rest mass (mp) 1.6726231 × 10−27 kg
Rydberg constant (R) 1.0973731534 × 107 m−1 = 2.1798736 × 10−18 J
speed of light (in vacuum) (c) 2.99792458 × 108 m s−1
← Units and Conversion FactorsWater Properties →

Attribution. Chemistry 2e, OpenStax, Rice University, and the contributing authors credited in the book. Licensed under Creative Commons Attribution 4.0 International. Source revision 32c719622f of openstax/osbooks-chemistry-bundle (2026-02-04). CC BY 4.0. Original source ↗. Text edition of a pinned CC BY 4.0 source revision of the OpenStax book, converted from CNXML by the EvidenceHelix importer. Original prose, learning objectives, tables, exercises, glossary and captions are preserved; images are not copied (figures link to the original source and keep their credits). No new content was added. Later revisions of this book can carry different licence terms and are not used.

In this chapter Contents

  • Preface
  • The Periodic Table
  • Essential Mathematics
  • Units and Conversion Factors
  • Fundamental Physical Constants
  • Water Properties
  • Composition of Commercial Acids and Bases
  • Standard Thermodynamic Properties for Selected Substances
  • Ionization Constants of Weak Acids
  • Ionization Constants of Weak Bases
  • Solubility Products
  • Formation Constants for Complex Ions
  • Standard Electrode (Half-Cell) Potentials
  • Half-Lives for Several Radioactive Isotopes

Source

OpenStax source file ↗

Illustrated original ↗

EvidenceLib is a research-education resource, not medical advice. It does not diagnose, prescribe or recommend starting, stopping or changing any treatment. Talk to a qualified clinician about your own situation. Methods, sources and licences · Rights and removal requests · Legal · Support