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प्रश्न
Explain why do vegetables and fruits get damaged during severe frost?
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उत्तर
Vegetables and fruits get damaged during severe fruits because the water present in them on freezing expands and burst open the cell walls of cells.
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संबंधित प्रश्न
Water is used as a cooling agent.
Give reason for Sea water does not freeze at 0°C.
On a winter day the temperature of the tap water is 20°C whereas the room temperature is 5°C. Water is stored in a tank of capacity 0.5 m3 for household use. If it were possible to use the heat liberated by the water to lift a 10 kg mass vertically, how high can it be lifted as the water comes to the room temperature? Take g = 10 m s−2.
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 does a glass bottle completely filled with water and tightly capped burst when placed in a freezer?
A deep pond of water has its top layer frozen. What will be the likely temperature of water layer at the bottom of the pond?
Why does a thick glass tumbler crack when very hot water is poured in it?
Observe the given graph and answer the following questions:
- Name the process represented in the figure.
- At what temperature does this process take place?
