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1.1 ,These test methods cover the determination of the size distribution and quantity of particulate matter contamination from aerospace fluids isolated on a membrane filter. The microscopical techniques described may also be applied to other properly prepared samples of small particles. Two test methods are described for sizing particles as follows:
1.1.1 ,Test Method A—,Particle sizes are measured as the diameter of a circle whose area is equal to the projected area of the particle.