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प्रश्न
What is heat? What is the S. I. unit of heat?
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उत्तर
Heat is a form of energy, which when absorbed by a body makes it hot and when extracted from a makes it cold. It is also defined as the total kinetic energy possessed by all the molecules of a body. The S. I. unit of heat is joule/kg kelvin.
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संबंधित प्रश्न
What do you understand by the following statements:
The specific heat capacity of lead is 130 Jkg-1K-1.
During the phase change does the average kinetic energy of the molecules of the substance increase?
Water property of water makes it an effective coolant?
A liquid X has specific heat capacity higher than the liquid Y. Which liquid is useful as coolant in car radiators.
Some heat is provided to a body to raise its temperature by 25°C. What will be the corresponding rise in temperature of the body as shown on the Kelvin scale?
Why are athletes advised to put on extra clothes after competing on event?
The cold object the hot object enclosed in one box of heat-resistant material.
- What changes will occur in the two objects when temperature flows from those objects?
- Which principle can show that the energy exchange takes place between two objects only when kept in isolated system?
Water has the lowest specific heat capacity.
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.
Find the odd one out:
