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प्रश्न
What do you understand by the ‘latent heat of vaporization’ of a substance?
उत्तर
The latent heat of vaporization of a given liquid is the heat required to convert one kilogram of the liquid into vapour at its boiling point without any change of temperature. It is measured in joule per kilogram. The latent heat of vaporization of water is 2260 × 103 J/kg. It means that we need 2260 × 103 J of heat to convert 1 kg of water at its boiling point into steam.
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संबंधित प्रश्न
State two factors upon which the rate of emission of thermions depends.
State any two measures to minimize the impact of global warming.
Write the approximate value of specific latent heat of ice.
Explain the following:
The surrounding become pleasantly warm when water in a lake starts freezing in cold countries.
Explain the following:
The heat supplied to a substance during it change of state, does not cause any rise in its temperature.
What is meant by latent heat? How will the state of matter transform if latent heat is given off?
Define the following terms:
(i) Specific latent heat,
(ii) Specific latent heat of fusion.
Explain why water is used in hot water bottles for fomentation and also as a universal coolant.
Why water get cooled in a ‘Surahi’ in hot season?
Define the term ‘specific latent heat of fusion’ of a substance.
Why do we feel much comfortable when we sit under a moving fan especially when our body is sweating?
Explain, why no tracks are left on the ice during ice skating?
Why does evaporation causes cooling and why is water used in hot water bottles?
Explain the meaning of greenhouse effect.
Calculate the total amount of heat required to convert 100g ice at 0°C to steam at 100°C.
(Specific latent heat of fusion of ice = 336 J/g, specific latent heat of vaporization of steam = 2260 J/g, specific heat capacity of water = 4.2 J/g°C).
If there is no Heat loss to the surroundings, the heat released by the condensation of m1 g of steam at 100°C into water at 100°C can be used to convert m2 g of ice at 0°C into water at 0°C.
(i) Find:
(a) The heat lost by steam in terms of m1
(b) The heat gained by ice in terms of m2
(ii) Form a heat equation find the ratio of m2 : m1
Specific latent heat of vaporization of steam = 2268 kJ/kg
Specific latent heat of fusion of ice = 336 kJ/kg
Specific heat capacity of water = 4200 J/kg°C
If pressure increases, the melting point of a substance ______.
Define boiling point of a liquid.
Write scientific reason.
The bottom of some steel utensils used for cooking is copper.
Define specific latent heat capacity
