Question

Containers A and B are filled with equal amounts of hot water at the same temperature. The temperature of the water in the containers are measured with a thermometer some time later. It is observed that container A has a much lower temperature than container B. What are the possible reasons? (i) Container A is painted black and container B is painted white. (ii) Container A has a lid and container B is not covered. (iii) Container A is made of aluminium and container B is made of plastic.

Answer 1

Answer:

I think all the statements are correct

Answer 2

Answer:

The container A has water at much lower temperature than container B. after sometime. this shows that (iii) Container A is made of aluminium and container B is made of plastic.

Explanation:

• The containers A and B had water at same temperature. After sometime the temperature of water in container A is found to be lower than temperature of water in container B.

• The most probable reason is (iii) Container A is made of aluminium and container B is made of plastic.  Aluminium is a good conductor of heat and plastic is a poor conductor of heat. This means metals, although they feel cooler or hotter to touch to other materials at the same temperature, easily transfer heat to cooler objects. As a result Aluminium will lose its heat much more quickly to the environment as compared to plastic. This will make the temperature of water in container A lower much more quickly as compared to temperature of water in container B.
• Had option (i) and (ii) been right then the temperature of water in container A had been higher than the temperature of water in container B as Black colour absorbs more heat and a container with a lid will allow less heat to escape.