( ( ( ( ( ( As ( these ( charged ( particles move ) ) ) ) ( , ( they ( ( ( collide frequently ) ( ( ( with ( one another ) ) and ) ( with ( gas ( ( atoms or ) molecules ) ) ) ) ) ( along ( their paths ) ) ) ) ) ) , ) and ) ( they ( ( convert ( some ( of ( their ( electric energies ) ) ) ) ) ( into ( thermal energy ) ) ) ) ) . )
(ROOT (S (S (SBAR (IN As) (S (NP (DT these)) (VP (VBD charged) (SBAR (S (NP (NNS particles)) (VP (VBP move))))))) (, ,) (NP (PRP they)) (VP (VBP collide) (ADVP (RB frequently)) (PP (PP (IN with) (NP (CD one) (DT another))) (CC and) (PP (IN with) (NP (NN gas) (NNS atoms) (CC or) (NNS molecules)))) (PP (IN along) (NP (PRP$ their) (NNS paths))))) (, ,) (CC and) (S (NP (PRP they)) (VP (VBP convert) (NP (NP (DT some)) (PP (IN of) (NP (PRP$ their) (JJ electric) (NNS energies)))) (PP (IN into) (NP (JJ thermal) (NN energy))))) (. .)))
As these charged particles move, they collide frequently with one another and with gas atoms or molecules along their paths, and they convert some of their electric energies into thermal energy.
(ROOT (S (PP (IN Within) (NP (DT a) (NN substance))) (, ,) (NP (NP (NNS atoms)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP collide) (ADVP (RB frequently))) (CC and) (VP (VBP move) (ADVP (RB independently)) (PP (IN of) (NP (CD one) (DT another)))))))) (VP (VBP are) (ADJP (ADJP (RBS most) (JJ likely)) (PP (IN in) (NP (DT a) (NN gas)))))))