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.
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The Moon is looking big and bright in the sky tonight, and we're not far away from the Full Moon. With so much of its surface illuminated, there will be plenty for you to spot tonight, so keep reading to find out what you can see.
Эксперты отмечают, что, если бы не их деятельность, стоимость фрахта VLCC никогда бы не взлетела до такого уровня, но теперь поставщикам приходится мириться с этим.