That occurs simply by physical processes, primarily gas being trapped as bubbles under the action of breaking waves.

Also, the gases trapped above the liquid surface are most likely lethal.

An air lock is gas trapped in a high point of a liquid-filled pipe system.

Sometimes they have gas trapped inside them.

When it is baked, the gas trapped by the whites expands, which causes the cake to rise.

The miners told of other gases, trapped in tunnel hollows.

Rather, gases trapped within the water sample is outgassing.

Biomass technology - which takes organic materials, waste products or gases trapped in the earth and turns them into fuel - is already widely used.

I found several, which held gasses trapped within the rock.

Obviously, there's gas trapped in the liquid, even in a bottle that has been sitting still.