When an ideal gas undergoes an isothermal expansion, the pressure of the gas in the enclosure falls. This is due to. the pressure of the gas in the enclosure falls. This is due to. When an ideal gas undergoes an isothermal expansion September 7, 2021 Category: Cengage NEET by C.P Singh , Chapter 19 - Kinetic Theory of Gases , Part 1 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related