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प्रश्न
Specific latent heat of vaporisation : J/kg : : specific heat : _______
उत्तर
Specific latent heat of vaporisation : J/kg : : specific heat : J/kg °C
APPEARS IN
संबंधित प्रश्न
Which has more heat: 1 g ice at 0℃ or 1g water 0℃? Give reason.
Explain the following:
The surrounding become pleasantly warm when water in a lake starts freezing in cold countries.
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℃?
During transformation of liquid phase to solid phase, the latent heat is ______.
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)
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)
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.
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.
What observation you will record and how will you determine the specific latent heat of fusion of ice?
Define boiling point of a liquid.
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.
Write the name.
The phase in which solid substances are converted into liquid.
During reheating, ice is converted to water at a temperature of 0 °C.
Write scientific reason.
Even if boiling water is constantly heated, its temperature does not rise.
Write scientific reason.
Use a pressure cooker to cook food in cold air.
