# Physico-Chemical Process (REX)

> REX is an ontology of physico-chemical processes, i.e. physico-chemical changes occurring in...

- Page: https://library.schematica.io/model/06c30c1717db4ab2ad4cde1581fc1021
- Model type: Ontology
- License: CC BY 4.0
- Access type: Free
- Access method: Download
- Model size: Small
- Formats: OBO
- Domains: Healthcare
- Audiences: Researcher
- External link: https://bioportal.bioontology.org/ontologies/REX
- Contact: Chebi Administrators (chebi-help@ebi.ac.uk)
- Listed in library: 2025-06-12
- Last updated: 2025-09-10

## Description

## Ontology Info

| Field | Value |
|-------|-------|
| Acronyme | REX |
| Description | REX is an ontology of physico-chemical processes, i.e. physico-chemical changes occurring in course of time. REX includes both microscopic processes (involving molecular entities or subatomic particles) and macroscopic processes. Some biochemical processes from Gene Ontology (GO Biological process) can be described as instances of REX. |
| Format | OBO |
| Categories | Physicochemical |
| Groups | OBO Foundry |

## Metrics

| Metric | Value |
|--------|-------|
| Classes | 552 |
| Individuals | 0 |
| Properties | 6 |
| Max Depth | 12 |
| Max Child Count | 18 |
| Average Child Count | 2 |
| Classes With One Child | 76 |
| Classes With More Than 25 Children | 0 |
| Classes With No Definition | 202 |

## Projects using REX

No projects using REX

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Source: https://library.schematica.io/model/06c30c1717db4ab2ad4cde1581fc1021