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प्रश्न
Why water get cooled in a ‘Surahi’ in hot season?
उत्तर
‘Surahi’ is made of clay which is porous (being not glazed) and so water oozes out (creeps out) and wets its entire surface. Form its outer surface, water get evaporated taking latent heat needed for evaporation from inside water as well as surrounding air and so the temperature of inside water falls.
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संबंधित प्रश्न
State two factors upon which the rate of emission of thermions depends.
The S.I. unit of specific latent heat is ______.
Calculate the total amount of heat energy required to convert 100 g of ice at −10℃ completely into water at 100℃. Specific heat capacity of ice = 2.1 J g-1 K-1, specific heat capacity of water = 4.2 J g-1K-1, specific latent heat of ice = 336 J g-1.
What is meant by latent heat? How will the state of matter transform if latent heat is given off?
Answer the following:
Explain the role of latent heat in the change of state of a substance.
Name two factors on which the heat absorbed or given out by a body depends.
The specific latent heat of vaporisation of steam is 2260 J/g. Comment on this.
Why do we feel much comfortable when we sit under a moving fan especially when our body is sweating?
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
Match the columns.
| Column A | Column B |
| 1) Absolute humidity | a) J or cal |
| 2) Latent heat | b) J/kg °C |
| 3) Specific heat capacity | c) kJ/kg |
| 4) Heat | d) no unit |
| e) kg/m3 |
Write the name.
Products obtained when sugar is heated.
The latent heat of vaporisation is a term referred for the conversion of gas into liquid.
During reheating, ice is converted to water at a temperature of 0 °C.
For the same mass of ice and ice-cold water, why does ice produce more cooling than ice-cold water?
Calculate the amount of heat required to convert 200g of ice at 0°C into the water at 0°C Specific latent heat of fusion of ice = 336 Jg-1
Specific latent heat of a substance ______.
The amount of heat energy required to melt a given mass of a substance at its melting point without any rise in its temperature is called as the ______.
