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प्रश्न
Water boils at 120 °C in a pressure cooker. Explain the reason.
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उत्तर
- The boiling point of a liquid rises with increased pressure and falls with decreased pressure. At one atmosphere pressure, pure water has a boiling point of 100°C.
- A pressure cooker does not allow steam to escape. Because of the increased pressure, the vapor pressure on the water inside the cooker rises to approximately 1.75 times that of the atmosphere, causing water to boil at around 120°C to 125°C.
संबंधित प्रश्न
Name a liquid which has the highest specific heat capacity.
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What impact will global warming have on the health of the affected population?
The ratio of specific heat capacity to molar heat capacity of a body _____________ .
A substance is heated at a constant rate from a low temperature to a high temperature. A graph of temperature against time is shown in the figure. Which part or parts of the graph correspond(s) to the substance existing in two states?
If, in a central heating system, steam enters a radiation pipe at 100°C and water leaves the radiation pipe at 100°C, can this radiation pipe heat a room? Give an explanation for your answer.
A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph below:
(i) What are represented by AB and CD?
(ii) What conclusion can you draw regarding the 110°c nature of ice from the above graph?
How much heat energy is released when 5 g of water at 20° C changes to ice at 0° C?
[Specific heat capacity of water = 4.2 J g-1 ° C-1 Specific latent heat of fusion of ice = 336 J g-1]
The specific heat capacity of water is 1 cal/g °C.
Water has the lowest specific heat capacity.
