28. When an ideal gas is isothermally compressed:
(A) thermal energy flows from the gas to the surroundings.
(B) thermal energy flows from the surroundings to the gas.
(C) no thermal energy enters or leaves the gas.
(D) the temperature of the gas increases.
(A) thermal energy flows from the gas to the surroundings.
(B) thermal energy flows from the surroundings to the gas.
(C) no thermal energy enters or leaves the gas.
(D) the temperature of the gas increases.