ABSTRACT
Gravimetric measurements performed for governance incorporate an arbitrary normalization methodology. This normalization was given the name “apparent mass vs. brass” and the “conventional value of the result of weighing in air,” also commonly referred to as “conventional mass” and “apparent mass.” The difference in density between brass and stainless steel negated the convenience of the apparent mass system, and eventually the conventional value of the result of weighing in air came into general use. The basis for apparent mass or, in the instance, the conventional value, is arbitrary but provides a basis to adjust weights for use in governance made from material of standard density and used at the standard air density and temperature. The conventional result of weighing in air does provide a norm for adjusting scales and balances. Weighing against brass weights had different meanings throughout the world.
