F1 glossary · Aerodynamics
Diffuser
The expanding rear section of the floor that helps accelerate and manage underbody airflow.
In plain English
This term belongs to the Aerodynamics side of Formula 1. Listen for it when commentators explain what a driver, car or team is doing and why the lap time or race situation is changing.
2026 context
Terminology on this site follows the current 2026 regulations. Older broadcasts and articles may use language that has since been replaced or narrowed.