filter
A filter (filter) has a function of removing (or weakening) a specific component of a given object. The action is called filtering. By weakening all components except for a certain component, there are cases in which the effect of emphasizing only that component is sometimes obtained. In addition, some processing may be applied to each component. ▪ Filtration equipment. Equipment and parts to remove solids and foreign matter mixed in the fluid. ▪ Filter paper, gas mask, cigarette mouthpiece, machine oil filter, fuel filter, air filter, etc. ▪ Filters for waveforms, images, etc. (filtering) ▪ Lens filters (optical filters). A device that limits the transmitted light by wavelength or polarization, or produces various optical effects. ▪ ...