The principle of hydraulic
pressure is composed of two cylinders of two sizes, filled with water or oil in the cylinder. The water is called "water pressure machine"; "oil press" is called "hydraulic
press". Each of the two cylinders has a slidable piston. If the pressure is added to the small piston, according to the law of Pasca, the small piston passes the pressure through the pressure of the liquid to the large piston, and the large piston is topped.
The cross-sectional area of the small piston is S1, and the downstream of the plus on the small piston is F1. Thus, the pressure of the small piston to the liquid is P = F1 / Si, which can be transmitted to the liquid to each direction by the liquid. "The pressure of the large piston is inevitably equal to P. If the cross-sectional area of the large piston is S2, pressure P The upward pressure F2 = PXS2 cross-sectional area of the small piston is a multiple of the small piston cross section.
From the above, it is known that a small force is added to the small piston, and a large force is obtained on the large piston, for this to press the plywood, oil, extract heavy object, forging steel, etc.