Mach number Mach number In fluid dynamics, the Mach number (M or Ma) (; ) is a dimensionless quantity representing the ratio of flow velocity past a boundary to the local speed of sound. where: By definition, at Mach1, the local flow velocity is equal to the speed of sound. At Mach0.65, is 65% of the speed of sound (subsonic), and, at Mach1.35, is 35% faster than the speed of sound (supersonic). The local speed of sound, and thereby the Mach number, depends on the condition of the surrounding medium, in particular the temperature. The Mach number is primarily used to determine
Mach and Daddy Mach and Daddy Peter "Mach" Machore and Martin "Daddy" Machore, better known as Mach and Daddy, are Panamanian duo brothers of Spanish reggae and reggaeton. The first single for which they were recognized, "La Botella" (""The Bottle""), charted throughout Latin America and hit #1 on the "Billboard" chart. Other popular singles included "La Juma" and "El Que Se Fue Pa Barranquilla". The duo's concerts attracted as many as fifty thousand people. They tour and perform throughout Latin America and the U.S. Peter Machore is "Mach" and Martin Machore is "Daddy". They derived their musical muse from their father, singer and