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The Hydraulic system pressure can be generated in the form of any physical action which result a compression over the Hydraulic system or pneumatic pressure which is developed in the form of air compressing externally can be applied to activate Hydraulic system. There is a constant relation between pressure density, and volume, According to Bernoulli’s equation. Liquids can be heated by applying high pressure without any external heat energy supplied to them. So the specific heat of any liquid system which is used in the hydraulic machinery must be more than enough to with stand the pressure applied over them also viscosity must be high enough for smooth conversion of external pressure applied over them to hydraulic pressure.