3 ms·

"Negative pressure"? Ughhh!

• tempay 9y ago
  Negative pressure is a common term when referring to differential pressure. The place I most commonly see it is for isolating rooms with positive[1] or negative[2] pressure relative to their surroundings. [1] https://en.wikipedia.org/wiki/Positive_pressure https://en.wikipedia.org/wiki/Positive_pressure [2] https://en.wikipedia.org/wiki/Negative_room_pressure https://en.wikipedia.org/wiki/Negative_room_pressure
• mrob 9y ago
  "Pressure" in common usage typically means "gauge pressure", which is zero-referenced to ambient air pressure.