If the mach number is >> 1, the flow speed is much higher than the speed of sound - and the speed is hypersonic. Example - Calculating an Aircraft Mach Number An aircraft flies at speed 500 mph at an altitude of 35000 ft. The surrounding temperature is -60 oF. The speed of sound ...
This measures barometric air pressure. It can predict weather changes, for example a sudden drop in air pressure could mean a storm is coming. When calibrated correctly it can be used to determine altitude, which helps GPS devices to lock on quicker and with greater accuracy. ...
These vehicles are driven by scramjet mode of operation at about 20–30 km altitude [1] where the ambient pressures and temperatures are low. To initiate combustion process under such conditions, it is necessary to compress the air to a required level [2]. Thus, ram compression is an ...