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Two aggregated regularized systems of equations for a multicomponent homogeneous gas mixture are considered. An entropy balance equation with a non‐negative entropy production is derived for them in the presence of diffusion fluxes. The existence, uniqueness and L2‐dissipativity of weak solutions to an initial‐boundary value problem for the systems linearized on a constant solution are established. The Petrovskii parabolicity and the local in time classical unique solvability of the Cauchy problem are also proved for the aggregated systems themselves.

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The article provides identification, analysis and evaluation of risks of metrological support of the laboratory. The authors used the SWIFT method to determine such characteristics as the causes, consequences of the occurrence of risk situations, as well as recommendation for risk management. Five risks were identified as a result of questioning the laboratory experts. The authors used FMEA analysis to determine the significance of each risk. For this, the authors additionally compiled scales of probabilities and severity of the consequences of risk events for the laboratory. The results of the assessment were formalized in the Risk Register and the Risk Management Action Plan. The consequences / probabilities matrix compiled from laboratory statistics was used as the evaluation criteria. As a result of the risk treatment taken, the level of significance of some risks decreased.