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SCIENTIFIC INSTRUMENTS FOR DETERMINING SURFACE AREA, POROSITY, PORE SIZE, PORE VOLUME, DENSITY, PARTICLE SIZE, PARTICLE CLASSIFICATION, [ CONTACT ANGLE, ] AND OTHER PHYSICAL PROPERTIES OF MATERIAL-NAMELY, POROSIMETERS, PYCNOMETERS, PARTICLE SIZE ANALYZERS, [ ANGLOMETERS, CENTRIFUGAL PARTICLE CLASSIFIERS, ] SURFACE AREA AND PORE VOLUME ANALYZERS, AND [ PERMEAMETERS ]