Advertisements
Advertisements
प्रश्न
How do fishes and aquatic animals survive when the pond gets covered with thick ice?
Advertisements
उत्तर
Water has an unusual physical property. When cooled, it first contracts in volume, as do other liquids, but at 4°C (maximum density), it starts expanding, and continues to do so till the temperature reaches 0°C, the point at which it freezes into ice.
The property of anomalous expansion of water enables marine life to exist in the colder regions of the world, because even when the water freezes on the surface, it is still liquid below the ice layer.
APPEARS IN
संबंधित प्रश्न
Name the gas produced when chlorine is dissolved in water and exposed to sunlight.
Give one word for the following statement:
The harmful substances dissolved in water .
Of the total water available on the earth, fresh water forms ______ percent.
The water in a lake is called ground water.
Select the correct answer of the following statement:
A solution which can pass through a filter paper but not through a semipermeable membrane.
State the causes of ‘eutrophication’.
If, at some place, it did not rain for a very long period of time, what would be its effect on the life of the people there?
Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?
In a filtration, plant water is filtered using layers of
What is water?
