In confined fluids, force in one direction can transmit pressure to all directions {hydraulics}|. Increased pressure changes into increased random molecule motions. For example, pushing a piston in a long thin cylinder can do work on fluid and increase molecule random kinetic energy, which can do work on a piston in a short wide cylinder.
area
At depth, force per area pressure is the same throughout confined fluid. Small force acting over long distance on small area can make big force acting over short distance on large area, because energy in and energy out are equal. Large area can apply large total force.
examples
Dams, breathing using lung double cavity, manometer, Bourdon gauge, barometer, hydraulic brakes, hydraulic lifts, syringe, and fluid tank show hydraulic effects.
Physical Sciences>Physics>Dynamics>Fluid>Pressure
5-Physics-Dynamics-Fluid-Pressure
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Date Modified: 2022.0224