Physical Property Data Standards (TREF-0001)
Defines how the archive reports chemical physical properties, especially boiling points, so that values are reproducible and their confidence is explicit.
Boiling points are reported with their measurement pressure
A boiling point is undefined without its pressure. Every terpene record in this archive reports the reference pressure alongside the value:
| Label | Meaning |
|---|---|
| Standard (atmospheric) boiling point | Boiling point at 101.325 kPa (760 mmHg) |
| Reduced-pressure boiling point | Boiling point at a stated lower pressure (e.g., 0.667 kPa / 5 mmHg) |
| Pressure not given | Used only where the reported value’s pressure is unknown; stated explicitly |
A boiling point is a property of the pure compound and is not a device setting and not an “activation temperature” for a vaporizer. See the boiling point vs device setting note.
Source hierarchy
The archive orders physical-property sources by confidence:
- Primary measurement (e.g., NIST Chemistry WebBook, SRD 69) — preferred.
- Peer-reviewed or authoritative reference with a stated method.
- Secondary literature — reproduced from a compilation; verified where possible.
- Estimated / predicted — computed values, never implied to be measured.
Where a value could only be sourced below the primary tier, the terpene record says so explicitly (e.g., “unconfirmed by NIST”, “Antoine estimate”, or “predicted”), rather than presenting it as a measured fact. Examples in this archive can be found across the Terpenes collection.
Relationship to evidence classification
Physical property confidence (this page) is distinct from biological-claim evidence class, which is governed by the Evidence Labels and Claim Grammar standard. A high-confidence boiling point does not license a clinical claim, and vice versa.
Related pages
- Terpenes Reference Index
- Evidence Labels and Claim Grammar (TREF-0003)
- Boiling Point vs Device Setting note (included on relevant pages)
Derived navigation generated from structured relationships. Links are labeled by edge class and evidence trace; derived links are navigation, not primary assertions.