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  4. Which of the following is a slow process?

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Q. Which of the following is a slow process?

J & K CETJ & K CET 2000

Solution:

When a system undergoes a physical change under the condition that the temperature of the system remains constant, then such a process is called isothermal.
For such a process to take place it is necessary that the system be surrounded by a perfectly conducting material.
In practise there is no material which is perfectly conducting, hence perfect isothermal process is impossible.
But when a process takes place very slowly, so that heat finds sufficient time to flow, then the process is approximately isothermal. While adiabatic process is a rapid process.