This type of gas is used in accumulators because of its inert qualities.

Nitrogen is commonly used in accumulators due to its inert qualities, which means it does not readily react with other substances. This is crucial in an accumulator system, as nitrogen can provide a stable gas environment without risking chemical reactions that might degrade the accumulator's performance or compromise the integrity of the hydraulic fluids involved.

Inert gases like nitrogen help maintain pressure without causing corrosion or degradation, making them ideal for applications where chemical reactivity is a concern. Unlike gases such as oxygen or carbon dioxide, which can participate in unwanted reactions within a system, nitrogen remains non-reactive under normal operating conditions, ensuring the efficiency and longevity of the equipment.

Neon, while also inert, is not used in hydraulic applications due to its rarity and high cost compared to nitrogen. Therefore, nitrogen's balance of inert characteristics and cost-effectiveness makes it the preferred choice for use in accumulators.