Aem Lect5

The document discusses several methods for determining the size of fine powder particles, including: 1. Calculating mean diameter based on measurements of individual particle sizes and accounting for polydispersity. 2. Using scanning electron microscopy and transmission electron microscopy to directly measure particle sizes. 3. Employing sedimentation techniques like photo-sedimentation and X-ray sedimentation, based on Stokes' equations, to determine particle size distributions. 4. Analyzing particle shapes using flow-based systems that inject a thin, monolayered stream of particles into a flow cell for microscopic imaging and size calculations.