On the measurement of the size characteristics of powders by photo-extinction methods. II. The experimental investigation of the photo-extinction laws

✍ Scribed by Rose, H. E. ;Lloyd, H. B.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1946
• Weight: 741 KB
• Volume: 65
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000650301

✦ Synopsis

TEE RELATIOYSEIP BETWEES OPACITY ASD POWDER COSCE> OF THE PHOTO-EXTINCTION LAWS ~ 5n+ TRATIOX Equntioii (c), giving the relotionship between the light extinctioli capacity of LI suspension nud the physicnl constants of the powder nnd nppnrntw, is theoretically true for nny concentrntion of the powder so if the law holds in prnetiee, for nny given powder, a plot of logngninst the eoiiccntratioii C ivould give a strnight line. 10 I1 Typicol expcrimeutol results are given in cmves, Fig. 8, wid it will be noticed that, witk tkc exception of the csrve reluting to Silica Test 8, the relationships are tiiienr. Tn the cases of the tests OR Iudiuu Iiik nnd Silicn Test A, tlic lincnlity holds until the extiuctiou exceeds 99-5%. For the Cndeby Slack the linear relotionship holds for the rnnge iiivestigated but, owing to this powder bcing rather COUPBC, a high value of extinction cniinot he obtnined unless esccssively high eoiicentmtions nre used.