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प्रश्न
How do fishes survive in frozen lakes?
उत्तर
Fishes survive in pond even when the atmospheric temperature is below 0°C. It is because of anomalous expansion of water. When the temperature falls below 0°C water changes into ice and rises to the top and ice being poor conductor of heat helps to keep water below it at 4°C and fish can live in pond water.
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संबंधित प्रश्न
Give reason for Sea water does not freeze at 0°C.
Explain the following:
What is the role of the anomalous behaviour of water in preserving aquatic life in regions of cold climate?
Calculate the time required to heat 20 kg of water from 10°C to 35°C using an immersion heater rated 1000 W. Assume that 80% of the power input is used to heat the water. Specific heat capacity of water = 42000 J kg−1 K−1.
A calorimeter contains 50 g of water at 50°C. The temperature falls to 45°C in 10 minutes. When the calorimeter contains 100 g of water at 50°C, it takes 18 minutes for the temperature to become 45°C. Find the water equivalent of the calorimeter.
What do you understand by the anomalous expansion of water?
Explain why do vegetables and fruits get damaged during severe frost?
Write the name.
The instrument used to study anomalous behaviour of water.
