Question

Two systems in thermal equilibrium with a third separately are in thermal equilibrium with each other.
The above statement is
A.First law of thermodynamics
B.Second law of thermodynamics
C.Third law of thermodynamics
D.Zeroth law of thermodynamics

Answer 1

Hint: There were usually three laws of Thermodynamics originally developed and established. This particular law was developed by the scientist Ralph H Fowler. He came with an alternative and numbered this as a lower number.

Complete step-by-step answer:
We call the law the Zeroth law of thermodynamics.
The zeroth law of thermodynamics states that "If the two thermodynamic systems are in equilibrium with the third system, then they are in thermal equilibrium with each other also”.
 When body A is in thermal equilibrium with body B and also with a body C, then body B and C will also be in thermal equilibrium with each other. The zeroth law is based on the temperature measurement.
We can also explain the above law in simple terms. In simple terms, the law can be stated as, “the systems that are in thermal equilibrium exists at the same temperature”.

Additional information:
We already know that in physics the thermodynamics deals with the temperature. The thermodynamics also deals with the properties of matter, heat, radiation, and the energy in other forms. The word thermodynamics was derived from a Greek word known as “thermos” meaning heat and “dynamics” meant powerful.
Thermodynamics is the branch of physics that is concerned with the other relationship between the energies and matter. The explanation of the conversion of heat energy into another form of energy is given in thermodynamics.
We know that there are four laws of thermodynamics.

The first law of thermodynamics:
According to the first law of thermodynamics the energy can be neither created nor destroyed. But it can be changed into one from others.

The second law of thermodynamics:
The second law of thermodynamics states that the energy is only in the form of heat and it transfers or flows from a higher state to the lower state.

Third law of thermodynamics:
The third law of thermodynamics is related to entropy. From the third law of thermodynamics, we can understand that the entropy of a perfect crystal is zero when the temperature of the perfect crystal is equal to the absolute temperature K.
As discussed before the zeroth law is the fourth law of thermodynamics.

Note: The zeroth law is important for the mathematical formulation. We can observe the zeroth law of thermodynamics in the thermometers. The characteristic change is taken as an indication of the change in temperature.