Overpressure is airpressure below normal or atmospheric pressure.

Overpressure is airpressure below normal or atmospheric pressure.

• A. False
• B. True
• C. Not defined
• D. Sometimes

Answer: (B)

Overpressure means pressure that is higher than the surrounding air pressure (atmospheric pressure). The term “over” implies an excess above ambient, not a deficit. If the pressure inside a space increases above outside pressure, that excess is overpressure; if it drops below outside pressure, that is underpressure (negative pressure). So the statement describing overpressure as being below normal is not correct. Overpressure is a positive difference above atmospheric pressure.

Overpressure means pressure that is higher than the surrounding air pressure (atmospheric pressure). The term “over” implies an excess above ambient, not a deficit. If the pressure inside a space increases above outside pressure, that excess is overpressure; if it drops below outside pressure, that is underpressure (negative pressure). So the statement describing overpressure as being below normal is not correct. Overpressure is a positive difference above atmospheric pressure.