give reasons
(a) A double layered blanket is warmer than a single thick blanket.
(b) The heating element of an electric kettle is at the bottom.
(c) Ventilators are provided near the roof of rooms in our houses
Answers
Hi, hope you are doing well. here's your answer.
a) Air is trapped in the space between two thin blankets. Since air is an insulator of heat, it prevents the escape of body heat. That is why two thin blankets are usually warmer than one thick blanket.
b) If you placed the heating element at the top and the kettle isn't full, the water wouldn't get heated because the element isn't there so you would still have a cold or at most lukewarm water. ... When it's at the bottom, hot water weighs less than cold water so it rises to the top, thus heating all the way through.
c) Ventilators are provided in the rooms at the top of the roofs because if the air inside the room gets hot, the hot air rises up and flows through these ventilators and thus cool air remains at the bottom. It brings cool and fresh air in the room.