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प्रश्न
Define the following terms:
(i) Specific latent heat,
(ii) Specific latent heat of fusion.
उत्तर
(i) sSpecific latent heat is the amount of heat required to change the state of unit mass of a substance without in temperature.
(ii) Specific latent heat of fusion isthe amount of heat required to change unit mass of a solid at its melting liqud at the same temperature.
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संबंधित प्रश्न
1 g ice of 0℃ melts to form 1 g water at 0℃. State whether the latent heat is absorbed or given out by ice.
The specific latent heat of fusion of water is ______.
A molten metal of mass 150 g is kept at its melting point 800℃. When it is allowed to freeze at the same temperature, it gives out 75,000 J of heat energy.
- What is the specific latent heat of the metal?
- If the specific heat capacity of metal is 200 J kg-1 K-1, how much additional heat energy will the metal give out in cooling to -50℃?
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.
Define the following terms:
(i) Latent heat,
(ii) Latent heat of fusion of ice.
Name two factors on which the heat absorbed or given out by a body depends.
When 1 g of ice at 0 °C melts to form 1 g of water at 0 °C then, is the latent heat absorbed by the ice or given out by it?
Why does evaporation causes cooling and why is water used in hot water bottles?
Derive an expression for the amount of heat given out or taken up, when its temperature falls or rises by t°C.
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
Specific latent heat of vaporisation : J/kg : : specific heat : _______
Match the columns.
| Column A | Column B |
| 1) Specific latent heat of fusion | a) Air saturated with vapour |
| 2) Specific latent heat of vaporisation | b) Solid converts into liquid |
| 3) Dew point temperature | c) liquid converts into gas |
Define specific latent heat capacity
Specific latent heat L = ______.
Who introduced the term latent heat?
600 g of copper at 50°C is mixed with lOOOg water at 20°C. Find the final temperature of the mixture. The specific heat capacity of copper is 0.4 Jg-1°C-1 and that of water is 4.2 Jg-1°C-1
