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प्रश्न
How do fishes survive in frozen lakes?
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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 of Water pipes burst in severe winter.
Give reason of Ice floats on water.
Give reason for Sea water does not freeze at 0°C.
Consider the situation of the previous problem. Assume that the temperature of the water at the bottom of the lake remains constant at 4°C as the ice forms on the surface (the heat required to maintain the temperature of the bottom layer may come from the bed of the lake). The depth of the lake is 1.0 m. Show that the thickness of the ice formed attains a steady state maximum value. Find this value. The thermal conductivity of water = 0.50 W m−1°C−1. Take other relevant data from the previous problem.
Water is cooled from 4 °C to 0 °C. It will :
Density of water is maximum at :
What are hot spots? How can you extract energy from a hot spot, if it does not come in contact with underground water?
What will be the approximate temperature of water in the lake shown in the following diagram?
(i) At X, and
(ii) At Y?
_______ apparatus is used to study the anomalous behaviour of water.
