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A pilot light is a small gas flame, usually natural gas or liquefied petroleum gas, which serves as an ignition source for a more powerful gas burner. Originally a pilot light was kept permanently alight, but this wastes gas. Now it is more common to light a burner electrically, but gas pilot lights are still used when a high energy ignition ...
Smoke detector mounted on a ceiling. A smoke detector is a device that senses smoke, typically as an indicator of fire.Smoke detectors/alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary.
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Yellow smoke screens deployed to mark soldiers completing an objective during Exercise Northern Edge 2017 Various signalling purposes require the use of colored smoke . The smoke created is a fine mist of dye particles, generated by burning a mixture of one or more dyes with a low-temperature pyrotechnic composition , usually based on potassium ...
A small metal "smoker box" containing wood chips may be used on a gas grill to give a smoky flavor to the grilled foods. Barbecue purists would argue that to get a true smoky flavor (and smoke ring) the user has to cook low and slow, indirectly and using wood or charcoal; gas grills are difficult to maintain at the low temperatures required ...
A light beam is passed through the smoke. A light detector is situated at an angle to the light source, typically at 90°, so that it receives only light reflected from passing particles. A measurement is made of the light received which will be higher as the concentration of smoke particles becomes higher. Optical obscuration.
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