Subsonisessa
Subsonisessa is a term used to describe phenomena or objects that travel at speeds below the speed of sound. The speed of sound in air is approximately 343 meters per second (767 miles per hour) at sea level and 20 degrees Celsius. When an object moves at a subsonic speed, it does not create a sonic boom, which is the shockwave generated when an object breaks the sound barrier.
In aviation, subsonic flight refers to speeds below Mach 1, where Mach is a unit of speed
The term subsonic can also be applied to other contexts. For example, certain types of weapons or