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If the sample material is "polydisperse"-i.e. has a spread of size of (say) 1.8:1 or more then knowledge of the material,s refractive index can be used to convert the result of a distribution analysis into a volume distribution. Sample narrower than this realistically only be assessed for mean size and a width parameter called the polydispersity. ÒÔÉÏÊǹâÉ¢ÉäÒÇÆ÷ʹÓÃ˵Ã÷ÖеÄÒ»¶Î»°£¬±¾È˸սӴ¥¹âÉ¢É䲻̫Ã÷°×Ôõô»ØÊ£¿Âé·³¹âÉ¢Éä·½ÃæµÄ¸ßÊÖÏêϸ½âÊÍһϡ£
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