( ( ( ( ( The torr ) , ) ( ( a unit ) ( of ( pressure ( used ( in ( vacuum measurements ) ) ) ) ) ) ) , ) ( ( is ( named ( after him ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN torr)) (, ,) (NP (NP (DT a) (NN unit)) (PP (IN of) (NP (NP (NN pressure)) (VP (VBN used) (PP (IN in) (NP (NN vacuum) (NNS measurements))))))) (, ,)) (VP (VBZ is) (VP (VBN named) (PP (IN after) (NP (PRP him))))) (. .)))
The torr, a unit of pressure used in vacuum measurements, is named after him.
(ROOT (S (NP (DT A) (NN torr)) (VP (VBZ is) (NP (NP (DT a) (NN unit)) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN pressure)))))))) (. .)))
A torr is a unit used to measure pressure.