how fast is the speed of lighting in mach
MACH TO SPEED OF LIGHT [VACUUM] (ma TO c) FORMULA. To convert between Mach and Speed Of Light [vacuum] you have to do the following: First divide 340.29 / 299792458 = 0.00000114. Then multiply the amount of Mach you want to convert to Speed Of Light [vacuum], use the chart below to guide you. 1 mach in speed of light [vacuum] = 0.00000114 ma. 10 mach in speed of light [vacuum] = 0.00001135 ma. 50 mach in speed of light [vacuum] = 0.00005675 ma.