It is simplest sense hydraulics has to do with certain characteristics of liquids such as water and oil. People query so far as the automotive chassis is concerned is related to the effects of pressure applied to a liquid. It is called Hydraulic pressure. Hydraulic pressure used in the b raking system in shock absorbers and in power steering systems. It is also used in automotive transmission system such as control circuits, fluid coupling, and torque converter, in engine it is more used in water pump, oil pump, hydraulic valve filters, fuel pump and others. It has been seen that increasing the pressure on a gas will compress the gas into a smaller volume. When pressure increase in a liquid its volume do not reduce. Its volume stay at the same even through the pressure on it is greatly increased. It is incompressible because a liquid can not be compressed into a smaller volume. The molecules of the liquid are rather close together as opposed to a gas in which
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