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प्रश्न
Give reason for Sea water does not freeze at 0°C.
उत्तर
Sea water contains impurities that decrease its freezing point. That is why it does not freeze at 0°C.
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संबंधित प्रश्न
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.
Density of water is maximum at :
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?
Give reasons for the following:
Even when the water in the lakes is frozen, fish can survive.
In cold regions, in winter the pipes for water supply break.
