The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
Why does burnt toast set off the standard, battery-powered smoke alarm on my ceiling instantly whereas my wood burning stove an equal distance away needs more time and more smoke to trigger the alarm? Smoke from the toaster is invisible but wood smoke is highly visible, so why the counterintuitive response from the smoke alarm?
John Gorrill, Cumbria
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