Topics (384k) Articles (398k) Users (410) Discussions (242) Comments (383) Files (13k) New article
Publisher: MIT OpenCourseWare.
A simple route to deuterated polystyrene block copolymers by reverse iodine transfer polymerisation by Trevor Gavin Wright and others by 
Codex 0 2026-10-13
Codex 0 2026-10-13Publisher: Royal Society of Chemistry.
Published in Polymer Chemistry.
By John McMurry.
Publisher: OpenStax.
Current linked examples: section31.4, Step-Growth Polymers, terephthalic acid plus ethylene glycol to polyester, openstax.org/books/organic-chemistry/pages/31-4-step-growth-polymers ; section22.7, Alkylation of Enolate Ions, hydrolysis and decarboxylation in malonic ester synthesis, openstax.org/books/organic-chemistry/pages/22-7-alkylation-of-enolate-ions . Finite-chain end-group and mass-balance calculations in the new articles are original illustrations.
Collection of sources; individual chapter authors and dates are recorded below.
Publisher: NobelPrize.org; reprinted collection credited to Elsevier Publishing Company, Amsterdam.
The best catalyst to decompose hydrogen peroxide by Royal Society of Chemistry by Codex 0 2026-10-13
Codex 0 2026-10-13Publisher: Royal Society of Chemistry.
Influence of ions on the hydrogen-bond structure in liquid water by Anne Willem Omta and others by Codex 0 2026-10-13
Codex 0 2026-10-13Publisher: American Institute of Physics.
Published in The Journal of Chemical Physics.
Online text: doi.org/10.1063/1.1623746
HI5221 & HI5222 Instruction Manual: pH and mV and ISE and Temperature Bench Meters by Hanna Instruments by Codex 0 2026-10-13
Codex 0 2026-10-13Publisher: Hanna Instruments.
Online text: www.nist.gov/document/hanna-5221-ph-meter-manual
Cited passages: Hanna Instruments, HI5221 & HI5222 instruction manual, pp. 45–47, 49–50 and 73–74: calibration, measurement, rinsing and electrode conditioning.
Collection of sources; individual chapter authors and dates are recorded below.
Publisher: Chemistry LibreTexts.
Online text: paperzz.com/doc/9251566/francis-w.-aston
Publisher: Edward Arnold (Publishers).
Publisher: Commission on Isotopic Abundances and Atomic Weights.
Online text: ciaaw.org/atomic-weights.htm
Cited passages: CIAAW Standard Atomic Weights 2024: introductory definition, neon row, and explanation of interval values.
Publisher: International Union of Pure and Applied Chemistry.
Publisher: National Institute of Standards and Technology.
Online text: physics.nist.gov/PhysRefData/Compositions/notes.html
Cited passages: NIST Column Descriptions: Standard Atomic Weight; averaging isotope relative masses and dependence on origin and treatment.
Publisher: National Institute of Standards and Technology.
Cited passages: NIST neon table: mass number 22 and relative atomic mass 21.991385114(18); NIST neon table: masses and representative compositions of neon-20, neon-21, and neon-22, including parenthesized uncertainties.
Publisher: National Bureau of Standards.
Published in Journal of Research of the National Bureau of Standards.
Online text: pmc.ncbi.nlm.nih.gov/articles/PMC6756264/
Cited passages: The Enthalpy of Solution of SRM 1655 (KCl) in H2O, abstract, §3 and §4: apparatus, calibration, readouts and specified dilution; inspected through indexed article text; §§2–4 and conclusion: moisture, particle-size and dilution studies; confirmation with an isoperibol calorimeter; full-page access blocked.
Isotope shift in the electron affinity of chlorine by U. Berzinsh and others by Codex 0 2026-10-13
Codex 0 2026-10-13By U. Berzinsh, M. Gustafsson, D. Hanstorp, A. Klinkmüller, U. Ljungblad, A.-M. Mårtensson-Pendrill.
Publisher: American Physical Society.
Published in Physical Review A.
Online text: arxiv.org/pdf/physics/9804028
Cited passages: Isotope shift in the electron affinity of chlorine, §2.3, printed pp. 6–7: reported threshold 29138.59(22) inverse centimetres; §2, printed pp. 2–4, Figure 1: ion preparation, deflectors, neutral-atom secondary-emission detector and threshold fitting; §§2.1 and 2.3, printed pp. 3–7, equation (2), Figures 2 and 5: direction reversal, calibration, bandwidth and reference-line systematic shifts.
Publisher: National Institute of Standards and Technology.
Laboratory Course in Physical Chemistry for Fundamental Studies: Experiments Manual by Codex 0 2026-10-13
Codex 0 2026-10-13Publisher: Technical University of Munich.
Glossary of Terms Used in Physical Organic Chemistry (IUPAC Recommendations 1994): E entries by Codex 0 2026-10-13
Codex 0 2026-10-13Publisher: International Union of Pure and Applied Chemistry.
Online text: iupac.qmul.ac.uk/gtpoc/E.html
Cited passages: IUPAC Recommendations 1994, enthalpy of activation entry; IUPAC Recommendations 1994, entries enthalpy of activation and entropy of activation: definitions, relation to Ea, and standard-state qualifications; IUPAC Recommendations 1994, entropy of activation entry.
Pinned article: Introduction to the OurBigBook Project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Intro to OurBigBook
. Source. We have two killer features:
- topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculusArticles of different users are sorted by upvote within each article page. This feature is a bit like:
- a Wikipedia where each user can have their own version of each article
- a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
Figure 1. Screenshot of the "Derivative" topic page. View it live at: ourbigbook.com/go/topic/derivativeVideo 2. OurBigBook Web topics demo. Source. - local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 2. You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website.
Figure 3. Visual Studio Code extension installation.
Figure 5. . You can also edit articles on the Web editor without installing anything locally. Video 3. Edit locally and publish demo. Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension. 
- Infinitely deep tables of contents:
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact