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# The role of idealisations in describing an isolated molecule

## Details

**Authors** Seifert, Vanessa A.

**Year** 2019

**Publisher** Foundations of Chemistry

**Kind of work** article

**Discipline** Chemistry

**Secondary disciplines** Philosophy, Physics

**Applied** false

[Read it at the publisher](https://doi.org/10.1007/s10698-019-09342-7) 
10.1007/s10698-019-09342-7

## In authors' words

### What they set out to do (purpose)

To examine how chemistry and quantum mechanics each describe an isolated molecule, focusing on the assumptions that such a molecule is stable and has a structure.

### Who or what was studied (sample)

Conceptual analysis of theoretical descriptions of molecules in chemistry and quantum mechanics.

### How they did it (methods)

Philosophical analysis drawing on the literature on idealisation.

### What they found (results)

The author argues that the assumptions of stability and structure are idealisations. Stability and structure depend on contextual factors such as thermodynamic conditions, experimental time range and environment, and stability can only be empirically identified with reference to those factors. The findings raise questions about the relation between the two theories and about the nature of stability and structure.

## Commentary

### In short

A philosophical analysis argues that describing a molecule as isolated, stable and structured is an idealisation, because those properties can be identified only relative to conditions such as environment and the time scale of observation.

### Response

The paper bears on Distinctions and Perspectives. Treating a molecule as isolated draws a boundary between it and its environment, and the paper argues that the properties attributed to it hold only relative to chosen conditions and time ranges, and differ between the chemical and quantum descriptions. Caveats: assessed from the abstract and publisher page only; the argument is philosophical, concerns an idealisation rather than a measurement, and the part-whole and relational aspects of molecules are not what the paper foregrounds.

**Patterns it shows** D, P

Shows the structure is there

**Added** 2026-10-21

**How to cite this** Seifert, Vanessa A. (2019). The role of idealisations in describing an isolated molecule. Foundations of Chemistry.