.BuildSysPro.IBPSA.Fluid.MixingVolumes.Validation.BaseClasses.TraceSubstanceConservation.Medium .BuildSysPro.IBPSA.Fluid.MixingVolumes.Validation.BaseClasses.TraceSubstanceConservation.Mediumpackage Medium = IBPSA.Media.Air(extraPropertiesNames = {substanceName});