# Subsonic ammunition

> Ammunition designed to operate at velocities below the speed of sound, which at standard conditions is less than 273 m/s (900 ft/s) or Mach 0.80

**Wikidata**: [Q17132684](https://www.wikidata.org/wiki/Q17132684)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Subsonic_ammunition)  
**Source**: https://4ort.xyz/entity/subsonic-ammunition