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Gas analysis. Preparation of calibration gas mixtures using dynamic volumetric methods - Diffusion method Ingestion-build-180956 indicating that an object ofBS EN ISO 6145 8: 2008 Gas analysis. Preparation of calibration gas mixtures using dynamic volumetric methods. Diffusion method BS EN ISO 6145 8 specifies a dynamic method for the preparation of calibration gas mixtures using diffusion. It covers calibration gas mixtures containing component mole fractions ranging from 109 to 103. The method specified in BS EN ISO 6145 8 also provides a relative expanded uncertainty of measurement. The method can be