What is the difference between gas and hydraulic shock absorbers?

Monroe Hydraulic vs Gas-Charged Shocks - French

How Do Shock Absorbers Work?

Shock Absorber Designs - Emulsion, Foam Cell, Nitrogen Gas, Monotube

Shock absorber - Wikipedia

G3S Shock Types

What Is The Difference Between Shocks and Struts? - Lou's Car Care & Fleet Services

Double-tube shock absorber functioning.

The difference between automotive and industrial shock absorbers

Shock Absorber Designs - Emulsion, Foam Cell, Nitrogen Gas, Monotube

The Difference Between Shocks and Struts

The difference between shocks and struts, and when do we need to replace them? - TL Motors Inc.

Shock Absorber Working Principle , Types , Function