BS ISO 3857-4:2012 pdf download – Compressors, pneumatic tools and machines — Vocabulary — Part 4: Air treatment 1 Scope This part of ISo 3857 identifies the terms andprovides the definitions for the vocabulary used inthe air-treatment field. 2Terms and definitions 2.1 absorption process of attracting one substance into the massofanother，so that the absorbed substancecombines with the absorbent 2.2 activated alumina highly porous and granular form of aluminium oxidehaving preferential adsorptive capacity for moisturefrom gases, vapours and some liquids 2.3 activated carbon any form of carbon characterized by high adsorptivecapacity for gases and vapours 2.4 actual vapour pressure partial pressure exerted by the vapour under theactual temperature condition of the environment 2.5 adiabatic expansion or compression of a gas without loss orgain of heat content 2.6 adsorption physical process in which the molecules of a gas,vapour or liquid adhere to the surface of a solid 2.7 aerosol suspension in a gaseous medium of solid particles,liquid particles or solid and liquid particles havingnegligible fall-velocity/settling-velocity 2.8 aftercooling removal of heat from the air after compression iscomplete 2.9 agglomerate group of two or more particles combined, joined orformed into a cluster by any means 2.10 ambient temperature temperature of the environment surrounding theequipment 2.11 attritionscouringscoring wear caused by rubbing or friction 2.12 breakthrough moment atwhich acontaminant is detecteddownstream of an adsorbent 2.13 brownian motion random movement of very small particles (less than0,2 um) caused by bombardment of those particlesby gas molecules Note 1 to entryAs a result of this random or spiralmovement,the particles describe paths much greaterthan their actual size and are, therefore, easier to trap. 2.14 channel subset, defined by an upper and a lower limit, of data for the full spectral range of a particle counting instrument in which the particle counts are stored 2.15 coalescing action of uniting small droplets 2.16 coincidence error error which occurs because at a given time morethan one particle is contained in the measurementvolume of a particle counter Note 1 to entry The coincidenceerror leads to ameasured number concentration which is too low and avalue for the mean particle diameter which is too high. [SOURCE:EN 14799:2007,3.17] 2.17 colony-forming unitCFU unit by which the culturable number is expressed 2.18 condensate liquid formed in the compressed air 2.19 condensation process of changing a vapour into liquid 2.20 contaminant any solid, liquid, or gas,which adversely affects thesystem [SOURCE: ISO 5598:2008，3.2.124,modified —The wording of the definiton has been modified.]...
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