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प्रश्न
How does the anomalous expansion of water help aquatic organisms in cold climates?
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उत्तर १
The anomalous expansion of water helps in the survival of water animals in very cold climates. Initially when the temperature of waterfalls, becomes heavier and sinks down. This process continues till 4°C. Then after this expansion takes place. The surface layer of water gets freezed. Ice being a bad conductor of heat does not allow loss of heat from the water below and results in the survival of water animals.
उत्तर २
When water is cooled it contracts and its density, increases until the temperature reaches 4°C, on further cooling water starts expanding with decrease in its density. This is anomalous phenomenon. The aquatic organisms can live there easily.
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संबंधित प्रश्न
Observe the following graph. Considering the change in volume of water as its temperature is raised from 0°C, discuss the difference in the behaviour of water and other substances. What is this behaviour of water called?
Explain the following:
In cold regions in winter, the rocks crack due to anomalous expansion of water.
On a winter day the temperature of the tap water is 20°C whereas the room temperature is 5°C. Water is stored in a tank of capacity 0.5 m3 for household use. If it were possible to use the heat liberated by the water to lift a 10 kg mass vertically, how high can it be lifted as the water comes to the room temperature? Take g = 10 m s−2.
Explain the following
A hollow glass sphere which floats with its entire volume submerged in water at 4°C, sinks when water is heated above 4°C.
What do you understand by the anomalous expansion of water?
Explain, why are the exposed water pipes lagged with straw during severe winter?
Give reasons for the following:
Even when the water in the lakes is frozen, fish can survive.
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 _______.
