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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 ______.
Explain the following:
How can you relate the formation of water droplets on the outer surface of a bottle taken out of refrigerator with formation of dew?
Explain the following:
In cold regions in winter, the rocks crack due to anomalous expansion of water.
On what basis and how will you determine whether air is saturated with vapour or not?
1 kg of ice at 0°C is mixed with 1 kg of steam at 100°C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 103 J kg−1 and latent heat of vaporization of water = 2.26 × 106 J kg−1.
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.
A calorimeter contains 50 g of water at 50°C. The temperature falls to 45°C in 10 minutes. When the calorimeter contains 100 g of water at 50°C, it takes 18 minutes for the temperature to become 45°C. Find the water equivalent of the calorimeter.
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.
Explain, why are the exposed water pipes lagged with straw during severe winter?
_______ apparatus is used to study the anomalous behaviour of water.
Observe the following diagram and write the answers to the questions given below.
- Which process does the graph represent?
- What is the range of temperature responsible for the behaviour?
A graph between the volume and temperature of water is shown. Explain the anomalous behaviour of water.
