There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
За последние два часа ракетную опасность объявили в Оренбургской, Самарской и Свердловской областях, а также в Чувашии, Татарстане, Башкирии и Удмуртии. Как пишет канал, эвакуированы сотрудники ряда предприятий, в учебных заведениях приостановлены занятия.
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