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Summary Zeroth law of thermodynamic for bsc 3 rd year syudents

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The zeroth law of thermodynamics is one of the four principal laws of thermodynamics. It provides an independent definition of temperature without reference to entropy, which is defined in the second law. The law was established by Ralph H. Fowler in the 1930s, long after the first, second, and thi...

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  • July 11, 2024
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  • 2023/2024
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Zeroth Law of Thermodynamics
Zeroth Law of Thermodynamics states that when two bodies are in thermal equilibrium
with another third body than the two bodies are also in thermal equilibrium with each other.
Ralph H.

Fowler developed this law in the 1930s, many years after the first, second, and third laws of
thermodynamics had achieved widespread acceptance.

Here Thermal Equilibrium implies that when two systems are in contact with a barrier
permeable only to heat, so there will be no change or transfer of heat.

Let’s learn more about Zeroth’s Law of Thermodynamics in this article!

What is Zeroth Law of Thermodynamics?

Consider two systems A and B, separated by a wall that does not allow any exchange of
energy between them. Such a wall is known as an insulating wall or adiabatic wall. The
third system C is separated from systems A and B by a conducting or diathermic wall as
shown in the figure.




Since energy can be exchanged between systems A and C, both A and C are in thermal
equilibrium. Similarly, energy can be exchanged between the systems B and C, so both B
and C are also in thermal equilibrium. In other words, both systems A and B are in thermal
equilibrium with the third system C separately.

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