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- Condenser (optics), in classical optics gathers visible light and directs it onto a projection lens
- Condenser (microscope), a group of lenses mounted below the stage of an optical microscope to concentrate light
- Capacitor, formerly called a condenser, an electrical device that can store energy
- Condenser microphone, a device that converts sound waves into an electrical signal
- Synchronous condenser, a rotating machine similar to a motor, used to control AC power flow in electric power transmission
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