Q. 84.0( 1 Vote )

Is a slow process always isothermal? Is a quick process always adiabatic?

Answer :

An isothermal process is represented by the equation


PV = constant … (i),


where


P = pressure


V = volume.


To keep this product constant, a small change in V will only produce a small change in P and vice versa. Hence, an isothermal process is usually a slow process.


On the other hand, an adiabatic process is represented as


PV𝛾 = constant … (ii), where


P = pressure


V = volume


The 𝛾= ratio of specific heat capacities at constant pressure to constant volume.


Now, 𝛾 > 1. Hence, the term V𝛾 will increase exponentially. Hence, to keep the product constant, a small change in V will cause a large change in P. Hence, an adiabatic process is usually a fast process.


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