neqsim-physics-explanations SKILL.md skillA
neqsim-physics-explanations from equinor/neqsim is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add equinor/neqsim/neqsim-physics-explanations@git:20260420.b26885aPins git:20260420.b26885a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- equinor/neqsim
- Path
.github/skills/neqsim-physics-explanations/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260420.b26885a, committed Apr 20, 2026
- First version recorded
- Mar 21, 2026
- Size
- 11,049 bytes
- Repository stars
- 167
- License
- Apache-2.0
Physics explanations for common NeqSim results. USE WHEN: users ask 'why' about simulation results, when explaining unexpected behavior, or when adding educational context to notebooks and reports. Maps common engineering phenomena to plain-language explanations.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# NeqSim Physics Explanations Reference explanations for common thermodynamic and process phenomena. Use these to add educational context to simulation results. ## Thermodynamic Phenomena ### Joule-Thomson Effect **What happens:** Gas cools when throttled (expanded through a valve) without doing work. **Why:** At moderate pressures, intermolecular attraction dominates — expanding gas molecules must overcome attractive forces, consuming internal energy, which lowers temperature. At very high pressures (above the inversion temperature), repulsive forces dominate and the gas heats up instead. **Typical values:** Natural gas JT coefficient: 0.3-0.7 K/bar. CO2: 0.5-1.2 K/bar (higher because stronger intermolecular forces). Hydrogen: negative (heats on expansion at ambient T). **Engineering significance:** JT cooling across choke valves can cause hydrate formation, wax deposition, or auto-refrigeration below material design temperature limits (MDMT). ### Retrograde Condensation **What happens:** A gas mixture forms liquid when pressure decreases (opposite of what you'd expect — normally, lowering pressure should vaporize liquid). …
Read the whole file at its exact version.
How to install
mdr add equinor/neqsim/neqsim-physics-explanations@sha256:2954175257f02c24The line at the top of this page pins the label git:20260420.b26885a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_u2vkpgdm5axwm66o)
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Versions
The registry has recorded 3 versions of this file, between Mar 21, 2026 and Apr 20, 2026, about one every 15 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260420.b26885a latest | 2026-04-20 | b26885a | 11,049 B | A | view · diff |
| git:20260418.a3c26d6 | 2026-04-18 | a3c26d6 | 9,463 B | A | view · diff |
| git:20260321.1d01844 | 2026-03-21 | 1d01844 | 9,435 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11049 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
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Source
equinor/neqsim · 167 stars · license Apache-2.0 · pushed 2026-11-08 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_u2vkpgdm5axwm66o GET https://markdownregistry.com/api/v1/resolve?ref=equinor/neqsim/neqsim-physics-explanations GET https://markdownregistry.com/api/v1/blob/2954175257f02c24a9cce63b059fb4cd00ca7f4406c50fd3f6896f4f9ec3cad5
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Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.