A review of the fundamental methods used for measuring gage pressures up to 1kPa

The accurate measurement of gage pressures up to about 1 kPa has important applications, especially in the field of aircraft instrumentation. The use of a number of primary standard instruments, with an uncertainty of measurement of about + or - 0.1 Pa, is described. These instruments are reviewed and detailed estimates of their uncertainties made. A brief outline of the procedures employed for the calibration of other instruments is also given.