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The passage literally says "work done by the system [expansion] is positive", which is why I chose positive.
The question stem does mention ideal gas, but I still can't mentally grasp how gas magically expands without doing any work on the environment...I mean it is EXPANDING. Would someone please give me sort of a step by approach/reasoning?
EDIT: This is under adiabatic conditions. I understand that Q is zero, but still can't grasp how W is zero when the gas is physically expanding.
The question stem does mention ideal gas, but I still can't mentally grasp how gas magically expands without doing any work on the environment...I mean it is EXPANDING. Would someone please give me sort of a step by approach/reasoning?
EDIT: This is under adiabatic conditions. I understand that Q is zero, but still can't grasp how W is zero when the gas is physically expanding.