English summary — Solid-to-gas ratio (μ = solids mass flow / conveying gas mass flow) distinguishes conveying regimes: dilute phase μ 1–8, intermediate 8–15, dense phase 15–35, and blow-tank dense phase up to 50. Higher μ means lower specific gas consumption and gentler particle handling, but demands higher pressure rating, tighter air-locking at the feeder and stronger piping.