Density of ultra-pure air at 298.15 K for mass transfer buoyancy corrections

Within the context of the general problem to attain improved accuracy for the transfer of apparent mass values, the PVT properties of ultrapure air at 298.15 K for low pressures have been determined. At 0.1 MPa, the accuracy of the molar density is estimated to be 0.001 percent. Our application of the isothermal Burnett method to obtain the "PVT" measurements, the analysis of these measurements, and the effects of systematic Burnett errors on the PVT results are discussed.