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Thermodynamic principle: which law dictates the direction of heat transfer? Identify the correct fundamental law governing heat flow from high temperature to low temperature. Choose the correct option.

Difficulty: Easy

Correct Answer: Second law of thermodynamics

Explanation:

Concept
The second law sets the direction of spontaneous processes: heat flows spontaneously from higher to lower temperature.


Why others are wrong
Zeroth law: defines thermal equilibrium/temperature.First law: energy conservation; no directionality.Kirchhoff's law: electrical circuits, not thermodynamic direction of heat flow.


Final Answer
Second law of thermodynamics.

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