Miles per hour
Miles per hour (English miles per hour, mph short ) is a unit of speed. Despite the official abbreviation for mi mile ( s ) this size is specified as hardly ever, mi / h ', except in technical publications.
An object that moves for one hour with 1 mph and covers a distance of a statute mile ( British country mile ).
The unit is used in some English-speaking countries who have not been introduced or implemented the metric system. In the United Kingdom and the United States is the usual mph unit on road signs speed limit.
Aircraft
Airspeed indicator of aircraft give the most based on the longer international nautical mile nautical unit knots (kn, kt earlier and plural kts ) at.
In smaller aircraft the other hand, the display is sometimes calibrated in mph, rather given in gliders and Russian planes in km / h.