Hydraulic Press


In this experiment, squeezing syringe to demonstrate Pascal's law.

Educational phase: fixation


Required aids+

  • two syringes
  • liquid (colored water)
  • food coloring
  • plastic tubing
  • stand
  • clamps


Experiment instructions+



Pascal's law is used in many devices and one of them is the hydraulic press. In his principle work such as car brakes. It makes use of that pressure is the same in all locations and therefore need only act on one of the pistons.

Experiment video+

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Physical interpretation+

Hydraulic press is one of many devices that use Pascal's law which tells us that the pressure of the fluid is the same in all places. Apply here the relationship:
p = \frac{F}{S}
,that is, if pressed smaller piston pressure is spread evenly in the liquid and eventually will affect the larger piston. We can therefore say that the true:
\frac{F_{1}}{F_{2}} = \frac{S_{1}}{S_{2}}
, where F1 and S1 is the force acting on the smaller piston and its contents, F2 and S2 are a great force on the piston and its contents.
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This experiment has been added 11.11.2011 by and since then have 10931 visits.
3.6.2014 21:44 © Krejčí Jan