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The four laws of thermodynamics summarize its most important facts. They define fundamental physical quantities, such as temperature, energy, and entropy, in order to describe thermodynamic systems. They also describe the transfer of energy as heat and work in thermodynamic processes. The experimentally reproducible distinction between heat and work is at the heart of thermodynamics; thermodynamics has nothing to say about processes in which this distinction cannot be made.
The four principles, or laws, of thermodynamics are:[1][2][3][4][5][6]
The zeroth law of thermodynamics recognizes that if two systems are in thermal equilibrium with a third, they are also in thermal equilibrium with each other, thus supporting the notions of temperature and heat.
The first law of thermodynamics distinguishes between two kinds of physical process, namely energy transfer as work, and energy transfer as heat. It tells how this shows the existence of a mathematical quantity called the

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