( it ( ( 's ( too ( useful ( as ( ( an illustration ) ( of ( ( ( ( ( molecules , ) ( heat transfer ) ) , ) and ) entropy ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP it)) (VP (VBZ 's) (ADJP (RB too) (JJ useful) (PP (IN as) (NP (NP (DT an) (NN illustration)) (PP (IN of) (NP (NP (NNS molecules)) (, ,) (NP (NN heat) (NN transfer)) (, ,) (CC and) (NP (NN entropy)))))))) (. .)))
it's too useful as an illustration of molecules, heat transfer, and entropy.
(ROOT (S (NP (NP (NNP Heat) (NN transfer)) (PP (IN by) (NP (NN conduction)))) (VP (VBZ occurs) (S (NP (NNS molecules)) (VP (VB collide) (PP (IN with) (NP (JJ other) (NNS molecules)))))) (. .)))
Heat transfer by conduction occurs molecules collide with other molecules.