Kelvin Planck Statement: Overview, Questions, Preparation

According to Kelvin Planck's statement, it is not possible to transfer the heat from one body to another without causing any other effect on the cycle. When heat is transferred, it causes other effects too, it is not controllable and sometimes is out of one's limits. In other words, it means that constructing an engine for the sole purpose of transferring heat into work is not possible.

This statement is a significant part of the second law of thermodynamics.

The kelvin Planck statement was brought together by understanding the two different statements, i.e., the Kelvin statement and the Planck statement. It was given by Lord Kelvin and Planck.

Kelvin described that it is impossible to cool down any matter below the highest cooling temperature to derive the mechanical effect of the objects.

On the other hand, Planck stated that the total addition of the entropies will always remain constant for the reversible system.

Clubbing together these individual statements, the Kelvin – Planck statements came into existence.

The perpetual motion machine of the second kind (PMMSK) was discovered by Wilhelm Ostwald; it was a hypothetical machine made for the sole purpose to transfer the heat into work without causing any other effects.

The second law of thermodynamics states that the use of heat is not limited to determine the work; it might have other effects. Heat would not cause only one effect in respect to work. It is impossible to do so. The second law of thermodynamics is also called the Kelvin statement. The kelvin statement can manifest the most prominent problems known to mankind. Despite all the fancy and advanced technological functions, the efficient heat engine has not yet been made.

The first law of thermodynamics determines the probability of building a perfect engine, but the second law of thermodynamics totally restricts it from doing so, in fact, forbids it.

Kelvin – Planck Statement for Class 11

The chapter 'Thermodynamics' holds a weightage of 3 marks. It includes 2 questions in total consisting of one objective type question of 1 mark and one short question of 2 marks.

Example 1: State thermochemistry.

Answer: Thermochemistry is the relation between heat and chemical reactions.

Example 2: State one use of the Second law of thermodynamics.

Answer: The heat always flows from a hotter body to a colder body. The second law of thermodynamics applies to all the types of heat engine cycles like Otto and diesel.

Example 3: Write one application of thermodynamics in our daily life.

Answer: Thermodynamics can be observed in the activities like heating and cooling the food, power engines in our motor vehicles, even the structural design of the buildings and vehicles.

Q: What do you mean by Kelvin – Planck statement?

Q: What is H in Planck’s equation?

Q: What do you mean by the Second law of thermodynamics?

Q: Who discovered Kelvin – Planck Statement?

Q: What is the hypothetical example of the Kelvin – Planck Statement?