Dictionary · Mass
Conventional mass
The conventional value of the result of weighing in air, based on a reference density of 8000 kg/m³ for the weight and 1.2 kg/m³ for air at 20 °C — the basis on which standard weights are specified per OIML R 111.
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Air buoyancy correction
The correction applied in precise mass comparisons for the differing volumes of the standards and the object weighed, proportional to air density and volume difference — dominant in high-accuracy mass work.
NIST SOP 2 / OIML R 111