underpressure
nounEtymology From under- + pressure.
1
insufficient pressure; a marked drop in pressure
- The expanding-hot-channel mechanism predicts an initial positive pressure change (an overpressure) while the electrostatic-pressure-relief mechanism predicts an initial negative pressure change (an underpressure).2007, Vladimir A. Rakov, Martin A. Uman, Lightning: Physics and Effects, page 378:
- Antonyms
- overpressure