What term describes a condition in which the air pressure inside a contained area is greater than the air pressure outside?

• A. Positive Air Pressure
• B. Neutral Pressure
• C. Negative Air Pressure
• D. Balanced Pressure

Answer: (A)

When the air pressure inside a contained area is higher than outside, air flows outward when doors or seals are breached. This outward movement keeps external, potentially contaminated air from entering the space, which helps protect people inside who are particularly susceptible to infections. This setup is described as positive pressure. In contrast, neutral pressure means inside and outside are equal, and negative pressure means air is drawn into the room from outside. So the described condition is positive pressure.