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  2. Maser - Wikipedia

    en.wikipedia.org/wiki/Maser

    The resonant frequency of the microwave cavity is tuned to the frequency of the hyperfine energy transition of hydrogen: 1,420,405,752 hertz. [15] A small fraction of the signal in the microwave cavity is coupled into a coaxial cable and then sent to a coherent radio receiver. The microwave signal coming out of the maser is very weak, a few ...

  3. Register (air and heating) - Wikipedia

    en.wikipedia.org/wiki/Register_(air_and_heating)

    A register is a grille with moving parts, capable of being opened and closed and the air flow directed, which is part of a building's heating, ventilation, and air conditioning (HVAC) system. The placement and size of registers is critical to HVAC efficiency. Register dampers are also important, and can serve a safety function.

  4. Frame rate - Wikipedia

    en.wikipedia.org/wiki/Frame_rate

    Many theaters had shown silent films at 22 to 26 FPS, which is why the industry chose 24 FPS for sound film as a compromise. [11] From 1927 to 1930, as various studios updated equipment, the rate of 24 FPS became standard for 35 mm sound film. [2] At 24 FPS, the film travels through the projector at a rate of 456 millimetres (18.0 in) per second.

  5. Kitchen ventilation - Wikipedia

    en.wikipedia.org/wiki/Kitchen_ventilation

    Kitchen ventilation is the branch of ventilation specialising in the treatment of air from kitchens. [1] It addresses the problems of grease, smoke and odours not found in most other ventilation systems.

  6. Kitchen hood - Wikipedia

    en.wikipedia.org/wiki/Kitchen_hood

    A kitchen hood, exhaust hood, hood fan, extractor hood, or range hood is a device containing a mechanical fan that hangs above the stove or cooktop in the kitchen. It removes airborne grease, combustion products, fumes, smoke, heat, and steam from the air by evacuation of the air and filtration. [ 1 ]

  7. Is it safe to stand in front of a microwave while it's on ...

    www.aol.com/lifestyle/safe-stand-front-microwave...

    The agency says: “Microwave oven manufacturers are required to certify their products and meet safety performance standards created and enforced by the FDA to protect public health.