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:
Magnetic Levitator - Classic
Revolving Multi-Color Fiberoptic Light
Scorpion, Ant, Wasp and Flower Bug
12 inch Galileo Thermometer
Enviro Battery 4M Kit
Wood Grain Newtons Cradle
Brush Robot 4M Kit
Tin Can Robot 4M Kit
Electric Plane Launcher 4M Kit