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Unformatted text preview: 411 Contents 18.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411 18.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411 18.3 Symbols and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433 Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435 Abstract: Terminology, definitions and symbols for particle characterization widely vary in different countries and fields of application. Therefore, definitions and symbols used in this book are summarized in this chapter. Moreover, the reader is strongly advised to check whether the definitions and symbols used in his or her country and field of application agree with the ones used here and in other literature. 18.1 Introduction Particle characterization started in many different fields of application by multiple techniques in many countries. Hence, many different definitions and symbols are used. Moreover, terminology has changed over time. Various written standards on terminology are given in the bibliography. Warning: Always check the meaning of definitions and symbols used in litera- ture from different countries and different fields of application, as they may be different. 18.2 Definitions Below, definitions are given that are relevant to the field of particle size measure- ment. More definitions are given in the relevant chapters. Chapter 18 Def initions and Symbols Good practice requires: • adequate definitions for terminology used • application of defined symbols H.G. Merkus, Particle Size Measurements, DOI 10.1007/978-1-4020-9015-8_18, © Springer Science+Business Media B.V. 2009 412 18 Definitions and Symbols Acceptance decision that a system is operating, or a product is produced, in a satisfactory manner with respect to a predefined quality level Absorbance logarithm of the fraction of incident electromag- netic radiation that is dissipated in a medium Absorption penetration of a substance, usually a gas or a liquid, in a solid substance with formation of an apparently homogeneous mixture (see also light absorption) Accuracy closeness of agreement between a test result and an accepted reference value (including both ran- dom and systematic errors) Acicular, needle slender, needle-shape for a particle of similar breadth and thickness (typically length:breadth: thickness = (10–100):~1:~1) Action/alarm limits points in a control chart, exceeding of which is unacceptable and should lead to immediate action (e.g., disposal of results, maintenance, recalibration) Adsorbate enriched adsorptive at the surface of the adsorbent Adsorbent solid that adsorbs the adsorptive Adsorption enrichment of the adsorptive at the surface of a solid substance Adsorption isotherm relation between the quantity of adsorbate and...
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This note was uploaded on 05/06/2010 for the course MECH. 28197 taught by Professor Dr.shafii during the Spring '10 term at Sharif University of Technology.

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fulltext_017 - 411 Contents 18.1 Introduction. . . . . . ....

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