Definitions for "Negative pressure"
A pressure below that of the existing atmospheric pressure taken as a zero reference. ( 081)
Less than atmospheric pressure.
A pressure below that of the surrounding atomspheric pressure at a specific point; a partial vacuum.
Keywords:  depressurization, see
See depressurization
a ventilation system designed so that air flows from the corridors into an isolation room, ensuring that contaminated air cannot escape from the isolation room to other parts of the facility
Keywords:  breathing, natural, form
A natural form of breathing.