Welcome to PhysLink.com - Your physics and astronomy online portal. Stay a while! Check out our extensive library of educational and reference materials. Also, check out our fun section!
What speed defines Mach 1? and why?
Asked by: Anthony Matarazzo
Mach number is a common 'ratio' unit of speed when one is talking about aircrafts. By definition, Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed medium through which the body is traveling. It is said that the aircraft is flying at Mach 1 if its speed is equal to the speed of sound in air (which is 332 m/s or 1195 km/hr or 717 miles/hour.) An aircraft flying at Mach 2 is flying at twice the speed of sound in air, etc.
Mach numbers are named after Ernst Mach (1838-1916), an Austrian philosopher and physicist. The term Mach number came into use in 1929.
Answered by: Anton Skorucak, M.S. Physics, PhysLink.com Creator
Here are our physics & astronomy bestsellers:
Space Wonder Gyroscope
KonusScience 5 Way Microscope Kit
12 inch Galileo Thermometer
Wood Grain Newtons Cradle
Brush Robot 4M Kit
Tin Can Robot 4M Kit
Electric Plane Launcher 4M Kit
Cherry Wood Levitron