Like hydraulic cylinders, something forces a piston to move in the desired direction. The piston is a disc or cylinder, and the piston rod transfers the force it develops to the object to be moved.[1] : 85  Engineers sometimes prefer to use pneumatics because they are quieter, cleaner, and do not require large amounts of space for fluid storage.
Because the operating fluid is a gas, leakage from a pneumatic cylinder will not drip out and contaminate the surroundings, making pneumatics more desirable where cleanliness is a requirement. For example, in the mechanical puppets of the Disney Tiki Room, pneumatics are used to prevent fluid from dripping onto people below the puppets.
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Thin film solar cell
At present, crystalline silicon solar cells are widely used, occupying the main market of solar cells. However, crystals are currently widely used in crystalline silicon solar cells, occupying the main market for solar cells. However, crystalline silicon solar cells have inherent weaknesses: the forbidden band width of silicon materials is Eg=1.12eV, and the solar photovoltaic conversion efficiency is relatively low; the silicon material is an indirect band material, and the light absorption coefficient of silicon is far in the visible range. Far less than other solar photovoltaic materials, such as the same absorption of 95% of sunlight, GaAs solar cells only need 5 to 10 microns thickness, while silicon solar cells require more than 150 microns thickness; therefore, when preparing crystalline silicon solar cells The thickness of the silicon wafer is 150-200 microns or more to effectively absorb solar energy; the crystalline silicon material needs to be purified several times, and the relative cost is relatively high; the size of the silicon solar cell is relatively small, and if the photovoltaic system is composed, it is necessary to use dozens of the same The silicon solar cells are connected together, resulting in higher system cost. Therefore, thin-film solar cells have attracted people's interest and have a certain degree of industrial application.