Scientists collected samples to analyze the atmospheric gases over the glacier.

She gases the balloons with helium for the festival.

The researchers documented the long-term health effects experienced by veterans exposed to nerve gases during training accidents.

Researchers discovered traces of several degraded mustard gases at the abandoned testing site.

Journalists wore masks after police used tear gases to disperse the crowd.

The commander tear gases the demonstrators to break up the march.

After the protest turned violent, the officer tear-gases the crowd to regain control.

The laboratory installed new filters to capture the harmful off-gases produced during the experiment.

The laboratory keeps several bottled gases in a secure cabinet to prevent leaks.

Researchers studied how liquid gases behave under extreme pressure to improve storage techniques.