Upon ascent, the air that is being lifted will expand and cool.

Heated air had simply expanded and sought an outlet.

At aircraft cabin pressure, the air normally present in the body cavities expands.

During the hot baths, the air expands in the timbers.

As the air inside the balloon expands, its pressure decreases.

As the air expands from heat, it rises to where the air pressure is less.

When you rise back up the air expands again, so your lungs return to normal size.

Any air trapped in a body cavity will expand, causing pain or damage to tissues.

The air expands your colon so that it is easier to see on an X-ray.

As you ascend back to the surface, the air in your lungs will expand.