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Water is used as a cooling agent.
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?
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.
Why does a thick glass tumbler crack when very hot water is poured in it?
Give reasons for the following:
Even when the water in the lakes is frozen, fish can survive.
When the temperature of water decreases below 4 °C it’s volume _______.
In cold regions, in winter the pipes for water supply break.
Match the columns:
| Column ‘A’ | Column ‘B’ |
| The density of water is maximum at | (a) 0°C |
| (b) 4°C | |
| (c) 100°C |
