What is the best forum for asking technical physics questions?

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litis
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Hello,

I'm chemist. Sometimes I need to understand physics and this isn't so easy for me.

I hope you will help me :).
 
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Hello litis. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif
 
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Hello,

maybe you can help me? Can you say your opinion about my topic - I would be gratefull

Is it correct:
that I have mesuared the illuminance (lumen) in the room. After that in front of the lux meters' fotosensor I put polymer (about 5*5 cm, quite close) first colourless and after I tried others. From these results can I calculate T (clearness)- the polymers' light permeability? Value with polimer (lux) divided by room illuminace (lux)(where T is I permeatable light / I falling light). Would it be a correct valuation?

How works a lux meter? Does it measure what is coming directly 90 degrees from the light source? Is it a problem that I have used small sample?
 
Who can comment this and discuss with me?