> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-editorial-guide/readme/authoring/domain-specific-modeling/substance/substance-naming-and-modeling-conventions/guidelines-for-specific-substance-types/substances-specifying-physical-state-or-physical-form.md).

# Substances specifying physical state or physical form

## Overview

Concepts specifying a particular physical state (e.g. liquid, solid, fumes, vapor, crystal, foam) of a substance should be represented as the sibling for the unspecified substance and also have a parent concept that relates to the structure of the substance.

Concepts specifying a particular physical form (e.g. micronized, macrocrystal, microsphere) should have a parent concept that relates to the structure of the substance and also an Is modification of (attribute) relationship to the unspecified substance concept.

## Modeling - Micronized substance

<table data-header-hidden><thead><tr><th width="210.66796875"></th><th></th></tr></thead><tbody><tr><td><strong>Parent concept</strong></td><td><p>Most distal appropriate descendant of 105590001 |Substance (substance)|</p><p>An additional parent concept to be allocated to denote physical form as appropriate</p></td></tr><tr><td><strong>Semantic tag</strong></td><td>(substance)</td></tr><tr><td><strong>Definition status</strong></td><td>Primitive</td></tr><tr><td><strong>Attributes</strong></td><td><p>738774007 |Is modification of (attribute)| relationship to the unspecified substance</p><p>726542003 |Has disposition (attribute)| as appropriate</p></td></tr></tbody></table>

## Naming

Fumes should be expressed in the plural (i.e. fumes as opposed to fume).

Fumes and vapor are different and so should not be used as synonyms on the same concept. <https://www.commerce.wa.gov.au/worksafe/gases-vapours-smoke-and-fumes>

### FSN

Pattern:

* X fumes (substance)
* X micronized (substance)

For example,

* Bauxite fumes (substance)
* Fenofibrate micronized (substance)

***

### Preferred Term

Pattern:

* X fumes
* X micronized

For example,

* Bauxite fumes
* Fenofibrate micronized

***

### Synonyms

Pattern: X form to represent EN-GB language variants where appropriate

For example,

* Fenofibrate micronised

### Exemplar

View of both stated and inferred form of 278945005 |Iron fumes (substance)|:

<div align="left"><figure><img src="/files/HYTePMJ0ZJ9wZhYQ7Urm" alt=""><figcaption></figcaption></figure></div>

Stated view of 414246008 |Fenofibrate micronized (substance)|:

<figure><img src="/files/h376hxbSRThuBrybiUhj" alt=""><figcaption></figcaption></figure>

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