isake atirikt dravy ke gun, dravyon Adult men paraspar snyog ke niyam, ooshma adi oorjaon ka dravy par prabhav, yaugikon ka snshleshan, jatil v mishrit padarthon se saral v shuddh padarth alag karana adi ka adhyayan bhi rasayan vigyan ke antargat kiya jata hai. avart sarani Adult men sat kshaituj pnktiyan hoti hain jinhen avart kahate hain. pristal