We had what seemed to be an overly sensitive smoke detector that would even go off when boiling water. Got sick of it and bought a new one that said on the packaging that it didn’t respond to steam. Sounded great except that a week later we discovered it didn’t respond to smoke either (burnt some cooking, lots of smoke) checked the battery, all that, it should have gone off with the smoke.
In: Engineering
Older ones have a radioactive sample inside releasing alpha particles. These are large particle that easily get blocked by particles in the air. They have a detector on the other side sensing the particles. When smoke gets in the middle, it blocks the particles. However steam will also block the particles, so set it off too.
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