Farah is taking an international flight. The absolute pressure in the cabin drops during the plane’s ascent, and as a result the bag of pretzels on her tray table undergoes an isothermal expansion. The bag contains n = 8.20 × 10−3 mol of air (which you may treat as an ideal gas), and remains in thermal equilibrium with the plane (T = 294 K) during the ascent. If Q = 4.30 J of heat flows into the bag of pretzels during the expansion, then what is the ratio between the final and initial volume of the bag Vf / Vi ? For the limits check, investigate what happens to this ratio if no heat flows into the bag (Q → 0) because the cabin is maintained at atmospheric pressure during the ascent.

Farah is taking an international flight. The absolute pressure in the cabin drops during the plane’s ascent, and as a result the bag of pretzels on her tray table undergoes an isothermal expansion. The bag contains n = 8.20 × 10−3 mol of air (which you may treat as an ideal gas), and remains in thermal equilibrium with the plane (T = 294 K) during the ascent. If Q = 4.30 J of heat flows into the bag of pretzels during the expansion, then what is the ratio between the final and initial volume of the bag Vf / Vi ? For the limits check, investigate what happens to this ratio if no heat flows into the bag (Q → 0) because the cabin is maintained at atmospheric pressure during the ascent.