Heat flows out from a system during

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BlackTom AI · Accepted Answer

The question asks about when heat leaves the system, so we need to consider how heat transfer behaves in different processes.
Option 1: Adiabatic expansion. In an adiabatic process, by definition no heat is exchanged with the surroundings (Q = 0). During expansion, the system does work on the surroundings and its internal energy decreases, but there is no heat transfer. Therefore heat does not flow out in this case.
Option 2: Isothermal expansion. Here temperature remains constant, which for an ideal gas requires that heat flows into the system to compensate for the work done by expansion (Q = W > 0 in the sign convention where work done on the system is negative). Thus heat flows into, not out of, the system during isothermal expansion.
Option 3: Adiabatic compression. In a true adiabatic process, there is again no heat transfer (Q = 0). During compression, the system does work on the surroundings and its internal energy increases, raising temperature, but there is still no heat flow. So heat does not flow out in adiabatic compression.
Option 4: Isothermal compression. This process keeps the temperature constant while the volume decreases, so the system must lose heat to the surroundings to offset the work done on the system. Consequently, heat flows out during isothermal compression.
In summary, among the given options, heat flowing out occurs specifically during isothermal compression, because maintaining constant temperature under compression requires removing heat from the system, whereas the other processes either involve no heat transfer or heat flow in the case of isothermal expansion.

SPHY001 Practice Quiz - Unit 15 | LA055

Heat flows out from a system during

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