21. Porous glasses are ideal for material separation, because of the small pore size distribution . 22. The parameter indicates the uniformity of the drop size distribution . 23. This results in the addition of very small, rapidly growing particles to the particle-size distribution . 24. Catalyst materials and pore size distributions need to be optimized to deal with these challenges. 25. This becomes even more important in a polydisperse sample with an unknown particle size distribution . 26. Aerosol particles can act as CCN's creating more droplets which have a smaller size distribution . 27. Hollow cone nozzles provide the smallest drop size distributions . 28. Tokay et al . ( 2008 ) studied the raindrop size distribution in topical cyclones. 29. Selected moments of the drop-size distribution yield rainfall rate, rainfall accumulation, and other rainfall properties. 30. They also developed functions relating the particle-size distribution to AWC, now known as continuous PTFs.