  Accounting of effective volumetric factor for the measurement at
inhomogeneous temperature allows to the simplify the measurement process
avoiding a pre-calibration with a noble gas. The volumetric correction in form
of the volumetric factor is calculated analytically by modeling of the
temperature profile in the volumetric apparatus, and provides a quite agreement
with the measured results. The calculation can be applied for each volumetric
measurement with an inhomogeneous temperature distribution.
