Above us there is at least several kilometers thick air layer, which acts on the force of gravity -> rise in the air, "atmospheric" pressure. Normal atmospheric pressure is 101325 Pa value. This value is surprisingly high, following an attempt to prove that pressure really has.
The existence of buoyancy force and its effect depending on the volume of the submerged body.
In this experiment, squeezing syringe to demonstrate Pascal's law.
Pressure is omnipresent. His work can be represented by a hedgehog.
In this experiment, squeezing the bottle to demonstrate Pascal's law.