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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
Calculate the mass of ice needed to cool 150 g of water contained in a calorimeter of mass 50 g at 32 °C such that the final temperature is 5 °C. Specific heat capacity of calorimeter = 0.4 J g-1 °C-1, Specific heat capacity of water = 4.2 J g-1°C-1, latent heat capacity of ice = 330 J g-1.
How much heat energy is released when 5.0 g of water at 20℃ changes into ice at 0℃? Take specific heat capacity of water = 4.2 J g-1 K-1, Specific latent heat of fusion of ice = 336 J g-1.
Define the term 'specific heat capacity' and state its unit.
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]
Two uniform brass rods A and B of length land 2l and radii 2r and r respectively are heated to the same temperature. The ratio of the increase in the volume ofB to that of A is ____________.
On supplying 100 µC of charge to a conductor, its potential rises by 5 V then capacity of the conductor is ______.
J/Kg °C is the unit of specific heat capacity.
Water has the lowest specific heat capacity.
Observe the following diagram and answer the questions given below:
Specific heat capacity of metals
- Which element has maximum specific heat capacity? Justify.
- Which element has minimum specific heat capacity? Justify.
- Define specific heat of object.
