Technician a says that a micron gauge is a better indicator of vacuum than a gauge calibrated in inches of hg. technician b says that the service valve cores are normally removed before evacuating the system. who is correct?

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)