Advertisements
Advertisements
Question
Explain the following
Fishes survive in ponds even when the atmospheric temperature is well below 0°C.
Solution
The anomalous expansion of water helps preserve aquatic life during very cold weather. When temperature falls, the top layer of water in a pond contracts becomes denser and sinks to the bottom. A circulation is thus set up until water in the pond reaches its maximum density at 4°C. If the temperature falls further, then the top layer expands and remains on the top till it freezes. Thus, even though the upper layer are frozen, the water near the bottom is at 4°C and the fishes can survive in it easily.
APPEARS IN
RELATED QUESTIONS
Draw a graph to show the variation in density of water with temperature in the range from 0°C to 10°C.
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.
Water is cooled from 4 °C to 0 °C. It will :
How do fishes survive in frozen lakes?
Explain, why does a glass bottle completely filled with water and tightly capped burst when placed in a freezer?
While studying anomalous behaviour of water in Hope’s apparatus, the upper temperature of the thermometer : 0 °C : : lower temperature of the thermometer : _______
In cold regions, in winter the pipes for water supply break.
Write scientific reason.
Placing a plastic bottle filled with water in the freezing compartment in the freezer can cause the bottle to explode.
