Joback method

The Joback method is an extension of the Lydersen method and uses very similar groups, formulas, and parameters for the three properties the Lydersen already supported (critical temperature, critical pressure, critical volume).

Version

v1 · 2026-09-28 · History

Domain-specific #

10188

Domain group

Applied Sciences & Engineering

Origin domain

Engineering & Design (beyond software)

Subdomains

Chemical Engineering Thermodynamics, Group Contribution Methods → Engineering & Design (beyond software)

Core Idea

Joback method is treated here as the recurring mathematicslogicstatistics identity summarized by this source-grounded definition: The Joback method is an extension of the Lydersen method and uses very similar groups, formulas, and parameters for the three properties the Lydersen already supported (critical temperature, critical pressure, critical volume). The Joback method, often named Joback–Reid method, predicts eleven important and commonly used pure component thermodynamic properties from molecular structure only. Joback in 1984 and developed it further with Robert C.

Scope of Application

• Basic principlesGroup-contribution method. These kinds of methods use basic structural information of a chemical molecule, like a list of simple functional groups, add parameters to these functional groups, and calculate thermophysical and transport properties.

• Documented setting. The Joback method, often named Joback–Reid method, predicts eleven important and commonly used pure component thermodynamic properties from molecular structure only.

• Basic principlesGroup-contribution method. Other group-contribution methods, especially methods like UNIFAC, which estimate mixture properties like activity coefficients, use both simple additive group parameters and group-interaction parameters.

• Model strengths and weaknessesStrengths. The popularity and success of the Joback method mainly originates from the single group list for all properties.

• Model strengths and weaknessesStrengths. This allows one to get all eleven supported properties from a single analysis of the molecular structure.

Clarity

A clear use of Joback method names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is The Joback method is an extension of the Lydersen method and uses very similar groups, formulas, and parameters for the three properties the Lydersen already supported (critical temperature, critical pressure, critical volume).

Manages Complexity

Joback method compresses multiple mathematicslogicstatistics details into a stable diagnostic relation. The source shows both the central mechanism—this allows one to get all eleven supported properties from a single analysis of the molecular structure.—and the practical consequence—joback assumes that there are no interactions between the groups, and therefore only uses additive contributions and no contributions for interactions between groups.

Abstract Reasoning

1. Type the carrier. Identify the mathematicslogicstatistics entities to which the claim applies.
2. State the relation. Use the source-grounded identity: The Joback method is an extension of the Lydersen method and uses very similar groups, formulas, and parameters for the three properties the Lydersen already supported (critical temperature, critical pressure, critical volume).
3. Check operation and conditions. It is, on the other hand, also possible to input the normal boiling point estimated by the Joback method.
4. Demand recognition evidence.

Knowledge Transfer

Within the home domain. Knowledge about Joback method transfers literally when a new case preserves the same carrier type, relation, and recognition test. These kinds of methods use basic structural information of a chemical molecule, like a list of simple functional groups, add parameters to these functional groups, and calculate thermophysical and transport properties as a function of the sum of group parameters. The Joback method, often named Joback–Reid method, predicts eleven important and commonly used pure component thermodynamic properties from molecular structure only. Beyond the home domain. No canonical parent is asserted for Joback method.

Neighborhood in Abstraction Space

Joback method sits in a moderately populated region (54^th percentile for distinctiveness): it has near-neighbors but no dense thicket of look-alikes.

Family — Condensed Matter & Physical Chemistry Models (26 abstractions)

Nearest neighbors

• Powder diffraction — 0.86
• Root-mean-square speed — 0.86
• Single Vegetative Obstruction Model — 0.86
• Determination of equilibrium constants — 0.85
• Dilution assay — 0.85

Computed from structural-signature embeddings · 2026-10-08