31.   A young, bow-tied waiter reflexively opened the door so the air pressure from the impending blast would not shatter the windows.

32.   Air pressure is intentionally left very low to allow them the greatest traction.

33.   Air pressure seals the doors so securely that some guards cannot budge them, effectively blocking primary evacuation routes to be used in the event of a fire.

34.   But it quickly cleared up, and doctors said they could leave the next week, though not by plane because of the changes in air pressure.

35.   But he was trapped in the reactor vessel compartment by a buildup in air pressure that jammed the hatches.

36.   But the Russians were not minimizing the seriousness of the accident and said they were prepared to order an evacuation if air pressure fell precipitously.

37.   But then, things quickly went awry because of faulty air pressure.

38.   By analyzing differences in air pressure, it forecasts how winds will blow.

39.   But water may have existed in the past, if the air pressure was higher and the climate warmer.

40.   Change in air pressure may cause this.