Where does color figure into it? TE has to be 'qualified' too. It can be bright and fine or dim and course, etc. So, TE isn't exact either. It takes all things considered to get an 'idea' of what you're looking at. I still hold that TE has "more" to do with particle distribution [density?] than size..to an observer...with a qualification that observation should include other observable factors such as color and , uh, visual texture?
It would be great if our eyeballs were scientific devices. Ken At 01:02 PM 10/26/01 -0400, you wrote: >Ode Coyote wrote: > >> ## Not exactly. >> TE has more to do with particle distribution..particles per cubic >> centimeter...than particle size. >> > >This is wrong. > >For particles much smaller than the wavelenght of light, such as colloidal >silver, the amount of scattered light is defined by I = >kNV^2/y^4, where k is a proportional constant, N is the number of particles, V >is the volume of one particle, and y is the >wavelength of the light. Thus if we go from a particle size of 1nm to 10 nm, >then V will go up by a factor of 10^3 or 1,000. The tyndall varies to the 5th >power of the linear particle size. > >A particle twice as large will have 8 times the volume and 512 times the >tyndall. The tyndall varies to the first power of the number of particles (N in >the equation). > >This is easy to see. 10 ppm of CS in ionic form (a huge amount of very small >particles) will have no visible tyndall, but 10 ppm of fairly large particles >will have a bright tyndall even though the number of particles will be 1/1000 as >many or so. > >Marshall > > > >-- >The silver-list is a moderated forum for discussion of colloidal silver. > >To join or quit silver-list or silver-digest send an e-mail message to: >[email protected] -or- [email protected] >with the word subscribe or unsubscribe in the SUBJECT line. > >To post, address your message to: [email protected] >Silver-list archive: http://escribe.com/health/thesilverlist/index.html >List maintainer: Mike Devour <[email protected]> > >
