Is a slow process always isothermal? Is a quick process always adiabatic?
An isothermal process is represented by the equation
PV = constant … (i),
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