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प्रश्न
Define the following terms:
(i) Latent heat,
(ii) Latent heat of fusion of ice.
उत्तर
(i) Latent heat is the amount of hidden heat supplied or extracted from the substance to change its state change of temperature.
(ii) Latent heat of fusion of ice is the amount heat absorbed by ice at 0°C to convert into water at 0°C.
APPEARS IN
संबंधित प्रश्न
State two characteristics of a good thermion emitter.
State any two measures to minimize the impact of global warming.
What do you understand by the term latent heat?
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.
- Which requires more heat: 1 g ice at 0℃ or 1 g water at 0℃ to raise its temperature to 10℃?
- Explain your answer in part (a).
Liquid ammonia is used in ice factory for making ice from water. If water at 20°C is to be converted into 2 kg ice at 0°C, how many grams of ammonia are to be evaporated? (Given: The latent heat of vaporization of ammonia = 341 cal/g)
Explain the following temperature vs time graph.
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.
Give one consequence of the high specific latent heat of fusion of ice.
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).
Find the odd one out and give its explanation.
How fog is formed?
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 |
During reheating, ice is converted to water at a temperature of 0 °C.
1 kg of dry air at a temperature of 40 °C can hold a maximum of 49 g of water vapour.
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
20 g of ice at 0°C absorbs 10,920 J of heat energy to melt and change to water at 50°C. Calculate the specific latent heat of fusion of ice. Specific heat capacity of water is 4200 J kg-1 K-1.
