Mach 0 refers to the speed of the object being equal to the local speed of sound. At sea level in standard conditions, this is approximately 343 meters per second, or about 1,235 kilometers per hour (767 miles per hour). If you’re asking about Mach 0 specifically, that means the object is traveling at the speed of sound, i.e., roughly 343 m/s (1,235 km/h or 767 mph) under standard conditions. Notes to consider
- The exact value of Mach 0 depends on ambient conditions such as temperature and pressure, because the speed of sound varies with temperature.
- At higher altitudes, the speed of sound changes, so Mach 0 corresponds to a different km/h or mph value depending on altitude.
