21.   Aside from a loss of air pressure, a number of factors can worsen the performance of the emergency brakes, transit officials and independent experts said.

22.   As the flame uses up the oxygen inside the jar, the air pressure in the jar will decrease, causing a vacuum to develop.

23.   Asthma has been linked with environmental factors like atmospheric temperature inversions, fog, rainfall, high humidity, low wind speed, high air pressure and organic dusts.

24.   A hurricane is an area of low air pressure that forms over oceans in tropical regions in either the North Atlantic Ocean or eastern North Pacific Ocean.

25.   A low-oxygen exercise room that the manufacturer says offers mountain training at normal air pressure.

26.   A major Gwinnett epicenter of damage was at Holcomb Bridge Road near Peachtree Corners Circle, where witnesses said the air pressure dropped suddenly.

27.   A gentle breeze passes over those entering the cavernous clean room, a sign of the positive air pressure that keeps dust and dirt flowing toward the outside.

28.   A supercharger boosts the intake air pressure above atmospheric pressure, meaning the total volume of the mixture to be compressed is increased.

29.   A supercharger boosts the intake air pressure above atmospheric.

30.   A sudden change in air pressure sealed an escape hatch, trapping him inside the reactor room as the sub began to sink.