Supercooled Liquid Vapor Pressures of the Polycyclic Aromatic Hydrocarbons
Bibliographic record
Abstract
The vapor pressure of the supercooled liquid ( P L ) for 35 unsubstituted and alkylated polycyclic aromatic hydrocarbons (PAHs) was determined as a function of temperature using a gas chromatographic retention time technique. Pyrene and 1,2-benzanthracene, two compounds with well-established temperature-dependent vapor pressures, served as standard reference compounds. The method was calibrated with nine PAHs for which the vapor pressures at 25 °C are known from measurements relying on gas saturation and gas effusion techniques. Enthalpies of vaporization Δ vap H were also determined. The P L data were evaluated by comparison with several sets of published data and found to be reliable. For most of the investigated PAHs, a strong linear relationship between log P L and molecular mass exists, ranging over more than 9 orders of magnitude. However, PAHs with bulky substituents, such as phenyl- and tert -butyl-groups, have a higher vapor pressure than would be expected on the basis of molecular mass, presumably because of the lack of molecular planarity.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".