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प्रश्न
Explain, why water is considered as best liquid for quenching thirst?
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उत्तर
Water has the highest specific heat capacity of 4.2 Jg-1 °C-1 and hence it can absorb large amount of heat energy, without rising in temperature sufficiently. Thirst is the natural signal, when body produces more heat energy than required. Thus, water is ideal for quenching thirst, because it can absorb large amount of heat energy.
संबंधित प्रश्न
Discuss the role of high specific heat capacity of water with reference to climate in coastal areas.
Who shall pay carbon tax ?
Name and state the principle used to measure the specific heat capacity of a substance.
(b) 2000 J of heat energy is required to raise the temperature of 4 kg of a
metal by 3°c. Which expression gives the specific heat capacity of the metal?
Ice-cream at 0°C feels colder than water at 0°C. Give reason for this observation.
Describe a method to determine the specific heat capacity of a solid (say, a piece of copper).
The SI unit of specific heat is _______.
Decide the unit for specific heat capacity.
Read this activity and answer the following questions.
- Take three spheres of iron, copper and lead. the lead of equal mass.
- Put all the three spheres in boiling water in the beaker for some time.
- Take the three spheres out of the water.
- All the spheres will be at a temperature 100 °C.
- Put them immediately on the thick slab of wax.
- Note, the depth that each of the sphere goes into the wax.
Questions:
- Which property is determined from this activity?
- Give name to that property.
- Explain the term principal of heat exchange with the help of this activity.
We would like to make a vessel whose volume does not change with temperature (take a hint from the problem above). We can use brass and iron `(β_(vbrass) = (6 xx 10^(–5))/K and β_(viron) = (3.55 xx 10^(–5))/K)` to create a volume of 100 cc. How do you think you can achieve this.
