11.   An auxiliary gas heater kicked in, keeping the air pressure stable.

12.   And rapid, large fluctuations in air pressure resulting from those fronts can affect how and when fish feed.

13.   As air pressure lowers in the spinning column, condensation occurs just below cloud base, revealing a funnel cloud.

14.   As a cluster of thunderstorms moves over tropical seas, air pressure can lower near its center.

15.   As a twister nears, air pressure does decrease as winds increase.

16.   As the speed increases, the bicycle shifts to higher gears and the computer reduces the air pressure of the suspension to soften the ride.

17.   As we ascend, the air pressure gradually decreases, and the amount of oxygen contained in the same amount of space decreases as well.

18.   As the air pressure drops, winds increase and a tropical depression may form.

19.   As the intense rays of the June sun heat the interior, rising currents develop, resulting in a lowering of the surface air pressure.

20.   As the intense rays of the June sun heat the interior, rising currents of hot air develop, resulting in a lowering of the surface air pressure.