Why is air in a hydraulic system dangerous?

 Hydraulic systems are engineered to function efficiently, with precision and dependability. For instance, in construction equipment, agricultural tractors, machinery for manufacturing, or industrial presses, these systems are based on one fundamental premise: using incompressible fluids for power transmission. When air is introduced into the system of hydraulics, this principle is affected, resulting in several serious problems with performance and the possibility of damage to equipment 

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