Crossword Clue:

degree of rarefaction below atmospheric pressure

AnswerCrossword Clue
BARICOf atmospheric pressure.
BAROOf atmospheric pressure: Prefix.
BARICOf atmospheric weight or pressure.
MILLIBARSmall unit of atmospheric pressure
SIPHONSDevices for withdrawing fluid by means of atmospheric pressure.
ISOBARAtmospheric pressure line
ANEROIDAtmospheric pressure measurer
TORRAtmospheric pressure unit
ISOBARICPertaining to atmospheric pressure