A boy maintains a aquarium. On a cold day he put a small heater inside theaquarium to make water in it slightly warm. After a few hours, he found all the fish dead. What is the reason for it?
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Solution
The solution is as follows:
1. Like humans, fishes also need oxygen to breathe and stay alive.
2. Oxygen is more soluble in cold water, than hot water.
3. When he put a small heater in the aquarium, all the oxygen from the water was expelled out and fishes died due to absence of oxygen.