supersonic

Imagine a jet plane streaking across the sky. If it breaks the "sound barrier," it is moving faster than sound. That is what this word means: going beyond the speed of sound.

It is often used for aircraft, but it can also describe other things that move this fast, such as bullets or rockets. When something moves faster than sound, it can create a sonic boom. The Concorde became famous for flights like this, cutting travel time across the Atlantic.

Supersonic describes anything traveling faster than the speed of sound, which is about 767 miles per hour (1,234 kilometers per hour) at sea level in air at 20 degrees Celsius. This is not just about being fast; it means an object is moving so quickly that sound waves cannot get ahead of it.

The term is most often used in aerodynamics, especially for aircraft that break the "sound barrier." When an object reaches this speed, pressure waves build up and can produce a sonic boom, the loud sound sometimes heard when a high-speed jet passes overhead.

However, the word is not limited to airplanes. It can also describe bullets, rockets, and flows of gas moving faster than sound in that medium. In science and engineering, you may also see phrases like "supersonic flow" or "supersonic jet."

Historically, reaching supersonic flight was a major technological challenge. Aircraft such as the Concorde and many modern military jets showed what was possible. Although commercial travel at these speeds became less common after the Concorde was retired, engineers are still working on quieter and more efficient designs.

So, whether you are talking about breaking the sound barrier, studying airflow, or describing very high-speed travel, this word points to motion beyond one of the most familiar limits in physics: the speed of sound.