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About Thermodynamics

What is thermodynamics?

Thermodynamics is one of the most important branches of physics that studies heat, temperature, and work and their effect on entropy, energy, and the physical properties of radiation and matter. The subject of thermodynamics consists of the four laws of thermodynamics.

These laws enable us to build a quantitative description using scientifically defined macroscopic physical quantities. These descriptions are explained in terms of microscopic constituents, another major branch of physics (statistical mechanics).

Thermodynamics is essential to many other vital subjects in engineering and science, especially mechanical engineering, physical chemistry, chemical engineering, and biochemistry. It even touches fields such as meteorology, to whom it may seem unrelated.

It sprung from a need to increase the efficiency of primitive steam engines. French physicist Sadi Carnot pushed for greater engine efficiency to help France win Wars. According to Wikipedia, Scots-Irish physicist Lord Kelvin, in 1854, offered the first formal definition of thermodynamics, stating, “Thermo-dynamics is the subject of the relation of heat to forces acting between contiguous parts of bodies, and the relation of heat to electrical agency.”

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Branches of thermodynamics

With time, thermodynamics has branched off into several related sub-disciplines. These subjects each apply the principles to different types of system, theoretical, or experimental subject matter using a different basic model.

Classical thermodynamics

Classical thermodynamics studies the states of near-equilibrium thermodynamic systems using measurable, macroscopic properties. We can use thermodynamic laws to model heat, work, and energy exchanges. As it represents our first successful attempt from the 19th century, we had termed it ‘classical.’ It captures observed and macroscopic changes to a system. Statistical mechanics followed it to help us understand these concepts microscopically.

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Statistical mechanics

Statistical mechanics, or statistical thermodynamics, came about after atomic and molecular theories emerged in the late 19th century. It bolstered classical thermodynamics by understanding the invisible interactions among individual particles or quantum-mechanical states.

It was the next step in the evolution of thermodynamics. It added the knowledge of microscopic properties of atoms and molecules to the observable theories of classical thermodynamics. Hence, it further explained classical thermodynamics microscopically in terms of classical mechanics, statistics, and quantum theory.

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Chemical thermodynamics

Chemical thermodynamics studies how a physical change of state or chemical reaction relates to changes in energy following the laws of thermodynamics. It primarily determines whether a transformation can happen spontaneously.

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Equilibrium thermodynamics

It studies transfers of energy and matter and energy in bodies or systems or bodies that can shift between states of thermodynamic equilibrium due to changes in their surroundings.

Thermodynamic equilibrium is a balanced state with zero macroscopic flows. In equilibrium, the tangible parts of the system don’t have any out-of-balance driving forces or potentials between themselves.

Equilibrium thermodynamics’s central aim is to figure out the final state of equilibrium of the system after a given thermodynamic operation has changed its surroundings or boundaries.

Non-equilibrium thermodynamics

The branch of thermodynamics studies systems that are not in thermodynamic equilibrium. It is true for most systems as they experience a sporadic or continuous exchange of energy and matter to and from other systems. We require more general concepts to study the non-equilibrium systems in comparison to equilibrium thermodynamics.

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Laws of thermodynamics

There are four fundamental laws in thermodynamics, and these laws are valid universally for systems that work within their constraints.

The zeroth law of thermodynamics

It states that if two systems individually have thermal equilibrium with a third system, they also have thermal equilibrium with each other. It establishes thermal stability as an equivalence relationship on a group of given thermodynamic systems. A system is in equilibrium if the random and minuscule exchanges inside it due to Brownian motion do not cause a net change in energy.

This law forms the basis of every measurement of temperature. If we have to establish if two bodies are at the same temperature, we need to bring them into contact and evaluate changes in their noticeable properties. The law was behind the construction of practical thermometers as it gave us an empirical definition of temperature.

The first law of thermodynamics

It is the law on the conservation of energy. According to it, we can neither create nor destroy energy; It can only change its form. For example, a moving electric vehicle may seem to produce energy; however, it converts electrical energy to kinetic energy.

In other words, the first law of thermodynamics states that the sum of the work (w) done on the system by the surroundings and the heat (q) that flows across its boundaries is equal to the system’s change in its internal energy (∆E).

ΔE = w + q

Suppose the net total of the work from the surroundings on the system and the heat flowing into it is positive. In that case, the internal energy of the system will increase. On the other hand, a decrease in the internal energy means that the sum of work done on the surroundings by the system and the heat flow out of the system is positive.

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The second law of thermodynamics

It states that the entropy of any isolated system will always increase. These systems automatically move towards thermal equilibrium, the state of maximum entropy the system can attain. The theory is that the entropy of the universe (the biggest known isolated system) is continuously increasing.

A simple example of the second law of thermodynamics is that a building, if not purposefully tidied and cleaned, will invariably become more disorderly and messy over time – regardless of all the efforts to keep it clean. When we clean the room, its entropy will decrease, but the effort to clean will increase the entropy outside the room, which will exceed the lost entropy.

The Third Law of Thermodynamics

It states that as the temperature approaches absolute zero, the entropy of a system approaches a constant value. The entropy of a system is typically zero at absolute zero. Specifically, the entropy of a pure crystalline substance (having perfect order) is zero at absolute zero temperature.

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