Key words: Fluid, Pressure, Specific Mass, Surface Stress, Capillarity, Viscosity, Bernoulli Law, Pascal Law, Archimedes Law
Fluid or liquid is substance that flow all of its part to other places in the same time. The
substance shapes in general divided into three, solid substance, liquid and gaseous substance.
Based on their size and form, substances have fixed shape and volume, but its form changes
suitable with the container, while gas do not has fixed form so both have abilities to flow.
Substance that able to flow or give little barrier toward the form change when be pressed is
called as flow substance, where flow substance is substance that flow all of its parts to other
place in the same time. Based on its movement, there is two kinds of fluid, that is static and
Pascal law to increase the elevation of water surface is instrument that can be used to
visualize work principle of Pascal law. Useful for education and society is expected be useful for
readers and able to open insight about hydraulic aspects. Based on Pascal law, it is obtained
principle that with small force able to produce larger force.
Airplane able to be lifted to air because the air rate that pass through the airplane wings
and airplane is not like rocket that is lifted up because of action and reaction between gas that
spurt by the rocket. The rocket spurt the gas to backward, and as reaction the gas push the rocket
forward. So, rocket can be lifted while no air, but airplane unable to fly if no air. The wing
sections of airplane have more sharper rear side and upper side that is more curved than the