Take a round bottom flask. Fill it half with water. Fix it to a stand as shown in the picture. Start heating the
flask. Place a crystal of potassium permanganate gently into the flask with a straw. Observe the
changes occur in the flask.
Q Name two or three insulators of heat which we use in our daily life.
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Some common insulators are: Glass, Air, Plastic, Rubber, Porcelain, and Wood.
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