particle size distribution

in atmospheric chemistry
The size of the liquid or solid particles in the atmosphere usually extends from > 0.01 to < 100 ┬Ám in diameter. In the earth's atmosphere the distribution function which describes the number of particles as a function of diameter, mass or surface area of the aerosol can be determined reasonably well with modern instrumentation.
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2205 (