Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
Squire told her he wished he had been able to communicate that help was on its way.
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В Финляндии предупредили об опасном шаге ЕС против России09:28
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