Question

during isothermal change pressure of system remains constant '---true or false --explain? ​

Answer 1

In the isothermal compression of a gas there is work done on the system to decrease the volume and increase the pressure. Doing work on the gas increases the internal energy and will tend to increase the temperature. ... For an ideal gas, this means that the process is also isothermal.

it is not generally true that Δ U = 0 in an isothermal process. An ideal gas by definition has no interactions between particles, no intermolecular forces, so pressre change at constant temperature does not change internal energy. ... Their internal energy changes with change in pressure, even if temperature is constant