The correct option for free expansion of an ideal gas under adiabatic condition is

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🧠 The Zero-Work Scenario
Free expansion is a special case in thermodynamics. Imagine a gas in one flask opening up into a vacuum. The gas "expands," but it's not pushing against anything.

🗺️ The Thermodynamic Proof
1. Adiabatic Condition: By definition, adiabatic means no heat exchange with the surroundings.
   
2. Free Expansion: Expansion into a vacuum means there is zero external pressure ().
   
3. Internal Energy ( or ): According to the First Law ():
   
4. Temperature (): For an ideal

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