" ▁Queensland ▁Department ▁of ▁Transport ▁and ▁Main ▁Ro ads , ▁July ▁ 2 0 0 7 . ▁ ▁External ▁links ▁▁ ▁Trans max ▁ ▁Department ▁of ▁Transport ▁and ▁Main ▁Ro ads ▁ ▁Category : Int ellig ent ▁transport ation ▁systems <0x0A> </s> ▁R he ology ▁( ; ▁from ▁Greek ▁ ▁, ▁' flow ' ▁and ▁, ▁, ▁' stud y ▁of ') ▁is ▁the ▁study ▁of ▁the ▁flow ▁of ▁matter , ▁primarily ▁in ▁a ▁liquid ▁state , ▁but ▁also ▁as ▁" soft ▁sol ids " ▁or ▁sol ids ▁under ▁conditions ▁in ▁which ▁they ▁respond ▁with ▁pl astic ▁flow ▁rather ▁than ▁de form ing ▁el ast ically ▁in ▁response ▁to ▁an ▁applied ▁force . ▁R he ology ▁is ▁the ▁science , ▁a ▁branch ▁of ▁physics , ▁that ▁de als ▁with ▁the ▁de formation ▁and ▁flow ▁of ▁materials , ▁both ▁sol ids ▁and ▁liqu ids . ▁ ▁The ▁term ▁r he ology ▁was ▁co ined ▁by ▁Eug ene ▁C . ▁B ingham , ▁a ▁professor ▁at ▁La f ay ette ▁College , ▁in ▁ 1 9 2 0 , ▁from ▁a ▁suggestion ▁by ▁a ▁colle ague , ▁Mark us ▁Re iner . ▁ ▁The ▁term ▁was ▁inspired ▁by ▁the ▁a ph or ism ▁of ▁Sim p lic ius ▁( o ften ▁attributed ▁to ▁Her ac lit us ), ▁ ▁( , ▁' every thing ▁flows ', ▁and ▁was ▁first ▁used ▁to ▁describe ▁the ▁flow ▁of ▁liqu ids ▁and ▁the ▁de formation ▁of ▁sol ids . ▁It ▁applies ▁to ▁subst ances ▁that ▁have ▁a ▁complex ▁micro