[pure-silver] Re: PMK

>Take oil and add as much water as you want and if the 
>mixture stands still, the oil will always  land up at the bottom. 

The only mistake here is that the oil will be on the top!

The only thing people are debating is how long is long and how much 
agitation is agitation.

My high school chemistry class had two 30-40 cm tall narrow glass 
measuring cylinders on a high shelf.  Both were filled with water.
One had a largish crystal of copper sulphate (greeninsh blue, soluble in 
water) dropped in the bottom, the other some other crystal (potasium 
permanganate maybe).  They had been sitting there for more than year, 
never touched.  The both crystals were disolving and slowly the colour was 
diffusing upwards.  The copper sulphate had coloured the water only an 
inch or two up.  The top was still perfectly clear.  The other one was 
already almost completely uniform,  though there was still a graduation in 
colour from light to dark at the bottom.  An excellent demonstration of 
diffusion.


Sandor

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