Lack of activity or exertion; habitual indisposition to action or motion / Absence of the power of self-motion; inertia.

plural of inertness

Unable to move or act; inanimate. / Sluggish or lethargic. / In chemistry, not readily reacting with other elements or compounds. / Having no therapeutic action.

(chemistry) A substance that does not react chemically.

To fill with an inert gas to reduce the risk of explosion.

simple past tense and past participle of inert

(chiefly of a fuel tank) Filled with an inert gas to reduce the risk of explosion

present participle of inert

The filling of the ullage of a fuel tank with an inert gas to reduce the risk of explosion.

plural of inert