( ( Air pressure ) ( ( ( is generally ) ( measured ( in ( hectopascals ( -LRB- ( ( formerly ( known ( as millibars ) ) ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Air) (NN pressure)) (VP (VBZ is) (ADVP (RB generally)) (VP (VBN measured) (PP (IN in) (NP (NP (NNS hectopascals)) (PRN (-LRB- -LRB-) (VP (ADVP (RB formerly)) (VBN known) (PP (IN as) (NP (NNS millibars)))) (-RRB- -RRB-)))))) (. .)))
Air pressure is generally measured in hectopascals (formerly known as millibars) .
(ROOT (S (NP (NNP Millibar)) (VP (VBZ is) (NP (NP (DT the) (NN unit)) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN air) (NN pressure)))))))) (. .)))