In physics, being able to get the naming rights of physical units is a task that only a master can achieve. For example, the cattle that describe gravity, the Hertz that describes electromagnetic waves, the amperes that describe electric currents, the Joules that describe energy, etc., are all behind the lifelong hard work of a physics master.
Today we will introduce a speed unit, Mach. The adjective Mach often appears on aircraft, we usually use meters, kilometers to describe speed and distance, and Mach is a special speed unit, which is used to describe aircraft and rockets, missiles and other aircraft. Mach's real name is Ernst. Mach, a famous Austrian scholar, was well versed in physics, philosophy, mathematics, etc.
Ernst. Born in 1838, Mach had never attended elementary or junior high school, had been self-taught at home, attended high school directly at the age of 15, was admitted to the University of Vienna at the age of 17, and received a doctorate in physics at the age of 22. To say that Maher was a genius is a matter of course. Not counting the Ph.D. in physics, he is also a professor in the Department of Mathematics. In the 19th century Mach's achievements can be said to be quite remarkable, famous for the philosophy of science, Mach is the main founder.
It's hard to imagine that this is still a scholar who has crossed multiple disciplines. Mathematics, physics, psychology, physiology, philosophy, Mach is almost all-encompassing, and has also achieved some important results in the intersection of these disciplines. Mach this unit, which Mach proposed, is quite important in fluid mechanics, is the ratio of the speed of motion of matter in the flow body to the speed of sound.
Mach 1 is the speed of sound, when the speed of the object exceeds Mach 1, it will form a sound barrier, the speed is lower than Mach 1, that is subsonic, the speed is higher than Mach 1, that is supersonic. In different environments, Mach's specific values are also different. In the field of cutting-edge cool fighters, Mach is the standard unit that describes the speed of a fighter. What do you think?