Sampling of powders.- Sampling of dusty gases in gas streams.- Sampling and sizing from the atmosphere.- Particle size, shape and distribution.- Sieving.- Microscopy.- Interaction between particles and fluids in a gravitational field.- Dispersion of powders.- Incremental methods of sedimentation size analysis.- Cumulative methods of sedimentation size analysis.- Fluid classification.- Centrifugal methods.- The electrical sensing zone method of particle size distribution determination (the Coulter principle).- Radiation scattering methods of particle size determination.- Permeametry and gas diffusion.- Gas adsorption.- Other methods for determining surface area.- Determination of pore size distribution by gas adsorption.- Mercury porosimetry.- On-line particle size analysis.