eli5: If water is non-compressible, then why not use it in hydraulic machines instead of hydraulic oil?

Question

eli5: If water is non-compressible, then why not use it in hydraulic machines instead of hydraulic oil?

In: 1817

Answer 1

I’m not even close to be an expert but I think it’s cause the boiling temperature. Most machines that require use of hydraulics work at higher temps. Water boils at 100°c and becomes gas that is pretty compressible.