( Conduction ( ( ( is ( about ( ( the transfer ) ( of energy ) ) ) ) ( by ( collisions ( between ( ( ( one particle ) and ) another ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Conduction)) (VP (VBZ is) (PP (IN about) (NP (NP (DT the) (NN transfer)) (PP (IN of) (NP (NN energy))))) (PP (IN by) (NP (NP (NNS collisions)) (PP (IN between) (NP (NP (CD one) (NN particle)) (CC and) (NP (DT another))))))) (. .)))
Conduction is about the  transfer of energy by collisions between one particle and another.
(ROOT (S (NP (NNP Conduction)) (VP (VBZ is) (NP (NP (DT the) (NN transfer)) (PP (IN of) (NP (NP (JJ thermal) (NN energy)) (PP (IN between) (NP (NP (NNS particles)) (PP (IN of) (NP (NN matter))))))) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBG touching) (S (VP (VBN called))))))))) (. .)))