Ratio of true airspeed to speed of sound in surrounding fluid (which varies as square root of absolute temperature). Mach 1 equals the speed of sound, which is 340.294 meters per second or 761.59 mph at sea level.

The aircraft speed divided by the speed of sound. Search for mach number books on Amazon.co.uk!-- google_ad_client = "pub-8826792545718317"; google_ad_width = 468; google_ad_height = 60; google_ad_format = "468x60_as"; google_ad_channel ="0630871714"; google_page_url = document.location; google_color_border = "DFF2FD"; google_color_bg = "DFF2FD"; google_color_link = "0000CC"; google_color_url = "008000"; google_color_text = "000000"; //-- Markings See also: International Aircraft Markings.

The ratio of the fluid velocity to the velocity of sound in the fluid, at the same temperature and pressure.

the ratio of local flow velocity to acoustic velocity.

Ratio of the speed of sound (340 meters/sec; 1,116 feet/sec)

The ratio of true airspeed to the speed of sound.

The relationship between a moving body and the speed of sound in that locality which can vary with temperature, altitude and there fore pressure.

is the ratio of the actual velocity at a given point to the velocity of sound in the same gas at the conditions existing at this point. These are known as local conditions. ( 755)

Dimensionless group used to indicate fluid flow regime with respect to compressibility. It is denoted by .

Local flow velocity divided by the local speed of sound, it is denoted by . Used as a dimensionless group indicating fluid flow regime with respect to compressibility.

Speed divided by the local speed of sound.

ratio of true airspeed to the speed of sound. Mach 1 is the speed of sound at sea level, ISA, approximately 1,100 feet per second or 760 mph.

dimensionless number, the ratio of a characteristic velocity in a fluid to the speed of sound in that fluid.

The ratio of the speed of a fluid to the speed of sound in that fluid. If the Mach number is greater than 1, the fluid is moving at a supersonic speed; if the Mach number is greater than 5, the fluid is moving at hypersonic speed.

Mach number (Ma) (pronounced: ) is a dimensionless measure of relative speed.