Particulate Size

Although particulate material varies in both size and composition, certain particle types are usually associated with a range of particle sizes. For example, particulate mater ial produced by crushing or grinding or resuspended from settled dusts is generally made up of particles with diameters larger than 1 /m. On the other hand, particulate material produced by condensation or gas-phase chemical reactions is comprised of many small particles, all much smaller than 1 /m in diameter. Figure 5.15.1 illustrates typical particle diameters for a variety of substances, including particulates such as beach sand and pollens. For comparison, this figure also includes the size range for types of electromagnetic radiation, estimates of gas molecule diameters, size ranges for fogs, mists and raindrops, and ranges for inspirable particles.

0 0

Post a comment