A fluid is extruded through a nozzle by expansion of a high pressure fluid. A fluid is any substance that consists of free-flowing particles. It includes liquid substances such as water flowing from faucets and gaseous substances such as air in the atmosphere. Although the bonding force between the particles in the liquid is weak, they can still move relatively freely. Since the particles are held together, the liquid has a fixed volume at a constant temperature.
The forces generated by a single moving particle in a gas stack can generate considerable pressure. Because the particles in the gas are not bound together, the gas does not have a fixed volume like a liquid: the particles continue to push outward. In this way, the gas expands and fills up all the open space.
As the gas expands, its pressure decreases, and the number of particle collisions decreases in any given area, so the pressure is simultaneously reduced. When the gas is compressed into a relatively small space, it creates a lot of pressure because there are more moving particles in a certain area.
Aerosol cans use these principles for a simple purpose: to extrude liquid material.
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