Determination of particle size distribution. Single particle light interaction methods - Light scattering aerosol spectrometer1 Scope This part of ISO 21501 specifies characteristics of a light scattering aerosol spectrometer (LSAS) which is used for measuring the size, number concentration and number size distribution of particles suspended in a gas. The light scattering technique described in this part of ISO 21501 is based upon single particle measurements. The size range of particles measured by this method is between approximately 0,06 m to 45 m in diameter. Instruments

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What is BS EN 15254‑4 about

• Measuring of holes

This is the international standard for manual ultrasonic testing of fusion-welded joints in metallic materials thicker than or equal to 8mm which exhibit low ultrasonic attenuation

BS 5459-2 seeks to ensure that the seating will not become a danger or cause injury to users when it is used as office seating in a manner which is forseeable

The aim of the BS 3900-B series is to provide the best industrial practice to determine the soluble metal content in paint

— specialized lighting systems

the entire structure of transportation systems needs to be studied

relative position and threaded hole dimensions of the anchorages for pelvic restraint (seat) belt assemblies intended to be used by the operators of agricultural tractors and self-propelled machinery

It then defines the overall safety life cycle requirements – such as hazard and risk analysis

those functions and characteristics that should be defined when specifying assemblies

These other structures can have a great range of variability in geometry and structural forms and