The main function is the transfer of force from one point to another. Some pneumatic machines also obtain mechanical advantage by converting a small force applied over a large distance to a large force applied over a small distance.
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Any pressure difference is irrelevant. The distinction is in the operating fluid. In pneumatic systems, it's a gas. In hydraulic systems, it's a liquid.
example of fluid friction are air resistance or drag because an object moving through air actually collides with miniature particles, specially dust particles .
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The formula for calculating the volume of fluid to the fluid container in which it is located. For example. If the container is cylindrical. Area x height = volume of liquid
An airplane flying through the air, a swimmer diving into a pool etc.