A Novel Method for the Calibration of Weights Used for the Direct Determination of Air Density

摘要

The method presented here avoids the need to determine the vacuum mass and displacement volume of weights used to directly determine air density. In the method, initially two weights of nominally equal mass and large volume difference are weighed on a balance at two widely different air densities. Using the balance observations and the calculated air densities at the time of weighing, constants are derived. In application of the method, air density is determined using these constants and balance observations for subsequent weighing of the weights. Experimental results are analyzed and the adequacy of the method is demonstrated. The user of this method to measure the air density benefits by precluding the need to measure air temperature, barometric pressure and relative humidity.