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What is isothermal Process? 1. An isothermal process is one in which the pressure and volume of the system change but  temperature  remains constant. 2. An isothermal process may be achieved a) If the gas is enclosed in a vessel whose walls are made of highly conducting material and b) The gas is compressed or allowed to expand very slowly. 3. When the gas expands, cooling will take place. But because the gas expends very slowly; hence before the temperature of the gas falls, heat is conducted into the cylinder through the conducting walls from the surroundings i.e., temperature of the  gas  remains almost constant. On the other hand, when the gas is compressed slowly, the heat produces escape to surroundings through the conducting walls before it could increase the temperature of the gas i.e, temperature of the gas again remains almost constant. 4. In case of ideal gas, the internal energy remains constant in isothermal process because internal energy of ...