Ключевые слова:
Fuels, Gas analysis, Gaseous fuels, Chemical analysis and testing, Gases, Natural gas, Quality, Quality assurance, Designations, Grades (quality), Chemical composition, Chemical properties, Physical properties of materials, Physical property measurement, Test equipment, Contaminants, Sampling methods, Interchangeability, Gas supply, Odours, Compositional tolerances, Aromatic hydrocarbons, Condensation, Legislation, Regulations, Formulae (mathematics), 2nd family gases, Aliphatic hydrocarbons