Advertisements
Advertisements
प्रश्न
How does the anomalous expansion of water help aquatic organisms in cold climates?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Give reason of Ice floats on 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.
A 50 kg man is running at a speed of 18 km h−1. If all the kinetic energy of the man can be used to increase the temperature of water from 20°C to 30°C, how much water can be heated with this energy?
Explain, why are soft drink bottles not completely filled?
What are hot spots? How can you extract energy from a hot spot, if it does not come in contact with underground water?
Observe the given graph and answer the following questions:
- Name the process represented in the figure.
- At what temperature does this process take place?
While studying anomalous behaviour of water in Hope’s apparatus, the upper temperature of the thermometer : 0 °C : : lower temperature of the thermometer : _______
Observe the given picture and answer the following questions.
- Which property do you understand in this picture?
- What is the temperature of the water at the surface?
- What is the temperature below the layer of ice on the surface?
