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.
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"Having greenlit rampant airport expansion, and now potentially a raft of data centres, it's unclear how ministers will ensure the UK sticks to its legally binding climate targets and prevents rocketing emissions and water usage," the Friends of the Earth spokesperson added.
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