( ( Thermal conduction ) ( ( is ( ( the transfer ) ( of ( ( ( ( internal energy ) ( by ( microscopic diffusion ) ) ) and ) ( collisions ( of ( ( ( particles or ) quasi-particles ) ( within ( a body ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Thermal) (NN conduction)) (VP (VBZ is) (NP (NP (DT the) (NN transfer)) (PP (IN of) (NP (NP (NP (JJ internal) (NN energy)) (PP (IN by) (NP (JJ microscopic) (NN diffusion)))) (CC and) (NP (NP (NNS collisions)) (PP (IN of) (NP (NP (NNS particles) (CC or) (NNS quasi-particles)) (PP (IN within) (NP (DT a) (NN body)))))))))) (. .)))
Thermal conduction is the transfer of internal energy by microscopic diffusion and collisions of particles or quasi-particles within a body.
(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))))))))) (. .)))