Explanation

Hydraulic power systems use fluids to transmit power and motion, and the most common fluids used are:

• Water (in hydraulic systems like water supply networks, fire suppression systems, and hydroelectric power plants)
• Oil (in hydraulic systems like heavy machinery, construction equipment, and industrial manufacturing)
• Non-compressible fluids (like hydraulic fluids, brake fluids, and transmission fluids) that are specifically designed for hydraulic systems.