9. A quantity of an ideal gas is compressed to half its initial volume. The
process may be adiabatic, isothermal or isobaric. Rank those three processes in
order of the work required of an external agent, least to greatest. (A)
adiabatic, isothermal, isobaric (B) adiabatic, isobaric, isothermal (C)
isothermal, adiabatic, isobaric (D) isobaric, adiabatic, isothermal (E)
isobaric, isothermal, adiabatic.