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.
When the whistle blows to start USA v Argentina on Sunday in Nashville, a new period of the Emma Hayes era will begin in earnest. The team preparing to play La Albiceleste in Tennessee for the 11th SheBelieves Cup, followed by Canada and Colombia, is the first in more than a year to feature no uncapped players.
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