What does "negative air pressure" indicate?

• A. Air pressure in the area is greater than outside
• B. Air flows into an area with decreased pressure
• C. The area is sealed from outside air
• D. A vacuum has formed in the area

Answer: (B)

Negative air pressure indicates a situation where the air pressure inside a specific area is lower than the air pressure outside of that area. This differential creates a flow of air moving into the area with decreased pressure, which can be crucial for controlling air quality and contamination levels. It is commonly utilized in settings like operating rooms or isolation rooms to ensure that air is pulled inward, preventing outside air, potential contaminants, or pathogens from escaping into the surrounding environment.

The concept of negative air pressure is significant in various medical and surgical contexts. It is often used to maintain sterile environments by limiting the entry of unfiltered air, thus protecting patients from infections. It also serves to contain airborne pathogens, which is critical in infection control.

In contrast, other options suggest conditions that do not accurately represent what negative air pressure entails. For instance, stating that air pressure is greater inside would contradict the very definition of negative air pressure. Similarly, the assertion that the area is sealed from outside air does not capture the essential aspect of air movement into the area, nor does the idea of a vacuum accurately symbolize the intended airflow dynamics associated with negative air pressure.