( ( ( ( ( closed ( system ( 36 ( A system ) ) ) ) ( that ( can ( exchange heat ) ) ) ) ( but not ) ) ( matter ( with ( its surroundings ) ) ) ) . )
(ROOT (NP (NP (NP (VBN closed) (NN system) (CD 36) (NNP A) (NN system)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB exchange) (NP (NN heat))))))) (CONJP (CC but) (RB not)) (NP (NP (NN matter)) (PP (IN with) (NP (PRP$ its) (NNS surroundings)))) (. .)))
closed system 36 A system that can exchange heat but not matter with its surroundings.
(ROOT (S (NP (DT A) (JJ sealed) (, ,) (JJ vacuum-insulated) (NN reaction) (NN flask)) (VP (VBZ approximates) (NP (NP (DT the) (NN condition)) (PP (IN of) (NP (NP (DT a) (VBN isolated) (NN system)) (, ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CC neither) (NP (NN matter)) (CC nor) (NP (NN heat))) (VP (MD can) (VP (VB be) (VP (VBN exchanged) (PP (IN between) (NP (NN system) (CC and) (NNS surroundings)))))))))))) (. .)))
A sealed, vacuum-insulated reaction flask approximates the condition of a isolated system, in which neither matter nor heat can be exchanged between system and surroundings.