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प्रश्न
Why do doctors advise to put a strip of wet cloth on the forehead of a person having high fever (temperature)?
उत्तर
This depends upon the fact that water in the process of evaporation takes away heat equivalent to latent heat from the patient’s body and thus lowers the temperature of his body.
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संबंधित प्रश्न
(a) Calculate the heat capacity of a copper vessel of mass 150g if the specific heat capacity of copper is `410 J kg^-1 K^-1`
(b) How much heat energy will be required to increase the temperature of the vessel in part (a) from 25°C to 35°C?
Explain the melting point ?
The melting point of naphthalene is 80°C and the room temperature is 30°C. A sample of liquid naphthalene at 100°C is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process.
Fill in the following blank using suitable word:
1 cal = .......... J
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Whenever mechanical work is done, .......... Is produced.
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Ice at o0C is colder than ...........at o0C.
1 kg of ice at 0o is heated at constant rate and its temperature is recorded after every 30 s till steam is formed at 100o C. Draw a temperature time graph to represent the change of phase.
1 kg of steam condenses to water at 100°C. How many joules of heat energy is liberated?
Name the greenhouse gases.
