Understanding Hydraulic Fluid Pressure

Hydraulic power provides one of the simplest and most powerful forms of producing considerable amounts of force within a confined space, using hydraulic fluid pressure to generate a force. Since the early inventions of low pressure and heavy hydraulic lifting jacks through to the latest state of the art high pressure hydraulic systems of today, hydraulic power has remained an extensively used and widely respected assistant to mankind’s drive for even greater power and knowledge.
Pascal’s law states that pressure applied at any point upon a confirmed fluid is transmitted undiminished in all directions within the fluid. This means that by using hydraulic pressure as a medium a small force can be converted into an appreciable multiple of itself.
The actual fluid pressure involved plays a very important role in this ‘Multiplication of Force’ and in this context there are two features of hydraulic pressure which is essential to remember:
1. Hydraulic pressure is measured as a force per unit of area e.g. Bar (kg/cm2) or PSI (Pounds per square inch).
2. The hydraulic pressure at any point within the fluid is the same in all directions provided of course that the fluid is static.
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