This experiment will help you understand the principle behind a piston's force.

First, fill the bulb syringe.

  Then attach the tubing to it. Squeeze the bulb syringe and you will see the water circulate in the tube and squirt out the opening.

   Attach the empty syringe to the other end of the tube.

  When you squeeze the bulb syringe, you will see water entering the piston and pushing its piston upward. The force is strong enough to lift or push small objects. The bulb syringe acts as a pump, sending pressurized water into the tubing. The pressure exerts force on the piston, which gets pushed outward.

  This is the same principle that drives the internal combustion engine, except that instead of water, engines cause a fuel-air mix to explode and push the piston.