A person put warm water in an aquarium, thinking that the fish would be more comfortable in it. However, the fish died. What can be the reason for this?

(HINT: the solubility of a gas in water goes down as its temperature increases)

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Solution

A fish needs the dissolved oxygen in water for respiration. Upon an increase in temperature, the solubility of oxygen in water decreases. The fish cannot get enough oxygen for respiration and hence dies.

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