11.   Sulfurous gas seeps through wisps of cloud.

12.   The gas seeped out and when a roadside food vendor lit his stove, an arc of flame enveloped the area, Pongsapat said.

13.   Then, hot rocket gas seeped through thermal insulation surrounding O-ring seals in the solid-fuel rocket boosters of Atlantis and Discovery.

14.   Technicians disassembling the motors of the Columbia shuttle found that hot gas had seeped inside motor joints.