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प्रश्न
Give reasons:
Water pipes burst in severe winters.
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उत्तर
During severe winters when the temperature starts falling below 4°C, water in pipelines expands (due to the property of anomalous expansion of water), and it exerts large pressure on the pipes, causing them to burst.
संबंधित प्रश्न
The amount of water vapour in air is determined in terms of its ______.
What is the role of the anomalous behaviour of water in preserving aquatic life in regions of cold climate?
Explain the following:
In cold regions in winter, the rocks crack due to anomalous expansion of water.
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?
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.
Explain the following
Fishes survive in ponds even when the atmospheric temperature is well below 0°C.
In cold countries, the water pipes are covered with poor conductors. Why?
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The following diagrams illustrate three situations involving thermometers which are labeled A, Band C. In each situation the thermometers indicate different readings.
(i) What do you expect the approximate reading of the thermometer B and C would be? Give a reason for your answer.
(ii) How would the readings of A and B help you in calibrating a thermometer?
What is the criterion of choosing the two metals for a bimetal strip?
Observe the given graph and answer the following questions:
- Name the process represented in the figure.
- At what temperature does this process take place?
_______ apparatus is used to study the anomalous behaviour of water.
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 a short note.
Anomalous behaviour of water
A graph between the volume and temperature of water is shown. Explain the anomalous behaviour of water.
