By James H. Vincent

ISBN-10: 008042029X

ISBN-13: 9780080420295

ISBN-10: 0080526853

ISBN-13: 9780080526850

ISBN-10: 1281072540

ISBN-13: 9781281072542

Aerosols in place of work atmospheres were - and remain - an immense concentration of commercial hygiene. even supposing there are numerous latest texts on aerosol technological know-how and on occupational wellbeing and fitness respectively, this new publication units out to be complementary to those and to supply a hyperlink among the 2 fields. specifically, the relevant suggestion of employee publicity ends up in a dependent technique which attracts jointly wide-ranging Read more...

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Extra resources for Aerosol science for industrial hygienists

Sample text

2. 3), that molecules may experience a very wide range of random velocities, in principle from zero to greater than 1000 m s -1. 5) we can see that Urms 13 > Um. 2. Statistical distribution of random velocities of air molecules under standard atmospheric conditions, indicating the mean and root-mean-square molecular velocity. 7) M is the number of moles of air in the box. 314 J ~ mole -1 (although it is sometimes useful to give it as 82 atmosphere cm 3 oK-1 m o l e - l ) . 6) n m is the number of moles of gas present, and T is the absolute temperature expressed in degrees Kelvin (~176 where ~ refers to temperature in degrees Centigrade).

Other factors include the friability of the bulk material ~ that is, its ability to be broken or crumbled. The actual process of aerosol generation and dispersal is also ultimately dependent on the movement of the surrounding atmosphere. As indicated in Chapter 2, there is in principle no upper limit on the size of individual particles produced in this way. The industries given as examples above are well-known to be 'dusty' and have long been the subject of industrial hygiene interest. For materials like those described, it is therefore relevant to discuss the question of 'dustiness'.

10) that the coefficient o f v i s c o s i t y is i n d e p e n d e n t o f p r e s s u r e , a n d - - f o r a g i v e n g a s - - is d e p e n d e n t only on temperature. 4. W h a t is the viscosity of air at S T P ? 6 x 10 -s m u m = 470 m s-1 Note also that the molecular mass is given by m = M/Na where N a is the number of molecules per mole (referred to as Avagadro's number) and is 6 x 1023 molecules per mole. 4 x 10 -6 kg m -1 s -1 (or N s m -2) N o t e , h o w e v e r , t h a t this r e s u l t h a s b e e n o b t a i n e d f r o m a c a l c u l a t i o n b a s e d on kinetic theory.

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Aerosol science for industrial hygienists by James H. Vincent

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