New PDF release: Aerosol Technology: Properties, Behavior, and Measurement of

By William C. Hinds

ISBN-10: 0471194107

ISBN-13: 9780471194101

New version of the textual content introducing the fundamentals of the sphere, together with glossy conception and purposes. Chapters conceal such themes as homes of gases, bioaerosols, uniform particle movement, Brownian movement and diffusion, respiration deposition versions, and sampling and size of focus. acceptable for pros, graduate scholars, and complex undergraduates. makes use of twin devices, with SI devices basic and cgs devices secondary.

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Extra info for Aerosol Technology: Properties, Behavior, and Measurement of Airborne Particles

Example text

The total numberof particles,and the summationsare over all intervals. The midpoint size dj can be the geometricmidpoint-the squareroot of the product of the upper and lower limits of the interval-or the arithmetic midpoint-the mean of the limits. The arithmeticmidpoint is used here for simplicity. The median is defined as the diameter for which one-half the total number of particles are smaller and one-half are larger. 5. The modeis the most frequentsize, or the diameter associatedwith the highest point on the frequency function curve.

If a particle size falls exactly on the interval limit, it is groupedin the higher interval. Thesegroupeddata are much easierto deal with and give the first glimpse of the shapeof the size distribution. Onegraphicalrepresentationof groupeddatais the histogram,shownin Fig. 1, where the width of eachrectanglerepresentsthe size interval and the height representsthe numberof particles in the interval. d U! UMOqS sy 11lAJ:)}U! q:>lI:) U! M 11IAJ:)} -U! IlIUJJOUS! :)q S~! }lIq} O}U! A\} AlqgnoJ U! Iqnop 'snq1 11lAJ:)}U!

If the GSD is the same,the ratio dS4%/dso% will be the same,for eachdistribution, and the cumulative distribution lines for other momentdistributions will be parallel to the cumulative count distribution line on a log-probability graph. The separation betweenthe lines (andbetweenmediandiameters)is a function only ofGSD. 1, plotted as cumulativedistributions on log-probability graphpaper. The horizontal axis refersto cumulativepercentof massfor the massdistribution line and cumulative percentof count for the count distribution line.

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Aerosol Technology: Properties, Behavior, and Measurement of Airborne Particles by William C. Hinds


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