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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
Explain the following:
In cold regions in winter, the rocks crack due to anomalous expansion of water.
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.
Describe an experiment to show that water has maximum density at 4°C. What important consequences follow this peculiar property of water? Discuss the importance of this phenomenon in nature.
Explain why do vegetables and fruits get damaged during severe frost?
Study the following diagrams and write down your observations.
When the temperature of water decreases below 4 °C it’s volume _______.
In a region with a cold climate the aquatic animals can survive at 4 °C, because _______.
