Poison Gas, the common term for various lethal or temporarily disabling gaseous substances used in warfare.

Almost any type of solid, liquid or gaseous substance can cause water pollution.

In the records of the official investigation, the agent is referred to as a "gaseous substance".

Each gaseous substance has its own 'fingerprint' and absorbs a certain pattern of light.

It is just more noticeable in a gaseous substance.

Quarry men used it to enclose dusty compartments and keep the air clean, since only gaseous substances could pass normally.

On the battlefield, it is nebulized and thus not a gaseous substance.

Many solids, liquids and gaseous substances can cause pollution if they enter the water environment.

It must come under the influence of the absorption of gaseous substance.

As Vaporlock, Natasha has the ability to transform her body into a gaseous substance.