What is mach one at sea level?

Mach one at sea level, which is the speed of sound, is approximately 343 meters per second (1,125 feet per second) at a temperature of 20°C (68°F). This speed can vary with changes in temperature and pressure, but at standard atmospheric conditions at sea level, Mach one is commonly accepted as around 1,225 kilometers per hour (761 miles per hour).