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प्रश्न
Explain why water is used in hot water bottles for fomentation and also as a universal coolant.
उत्तर
Hot water bottles are used for fomentation since since water does not cool quickly due to its large specific heat capacity.
Water is used as an effective coolant because of its large specific heat capacity due to which it can extract more heat.
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संबंधित प्रश्न
State two factors upon which the rate of emission of thermions depends.
What is the Greenhouse effect?
What is the energy absorbed during the phase change called?
- 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).
The S.I. unit of specific latent heat is ______.
Explain the following temperature vs time graph.
A thermally insulated pot has 150 g ice at temperature 0°C. How much steam of 100°C has to be mixed to it, so that water of temperature 50°C will be obtained? (Given : latent heat of melting of ice = 80 cal/g, latent heat of vaporization of water = 540 cal/g, specific heat of water = 1 cal/g °C)
Explain the following temperature vs time graph.
Water expands on reducing its temperature below ______°C.
What is the name given to the energy absorbed during a phase change?
Why does weather become pleasant when it starts freezing in cold countries?
What observation you will record and how will you determine the 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).
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 ______.
Write the name.
Products obtained when sugar is heated.
During reheating, ice is converted to water at a temperature of 0 °C.
Write scientific reason.
The bottom of some steel utensils used for cooking is copper.
For the same mass of ice and ice-cold water, why does ice produce more cooling than ice-cold water?
2875 J of heat is required to melt 115 g of lead at its melting point. Calculate the specific latent heat capacity of fusion of lead.
