The statement that ‘heat cannot flow by itself from a body at a lower

The statement that ‘heat cannot flow by itself from a body at a lower temperature to a body at a higher temperature’, is known as

Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Third law of thermodynamics
This question was previously asked in
UPSC NDA-2 – 2017
The correct answer is Second law of thermodynamics.
The statement that ‘heat cannot flow by itself from a body at a lower temperature to a body at a higher temperature’ is one of the standard formulations (specifically, the Clausius statement) of the Second Law of Thermodynamics. It describes the natural direction of heat flow.
The Zeroth law of thermodynamics defines thermal equilibrium and establishes temperature as a property. The First law of thermodynamics is a statement of the conservation of energy, relating heat, work, and internal energy. The Third law of thermodynamics deals with the entropy of a system at absolute zero temperature.
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