What is Thermodynamics?


What is thermodynamics? In briefly, thermodynamics is the study of energi and its transformation. It studies and interrelates the macroscopic variables, such as temperature, volume and pressure.

There are 4 laws of thermodynamics, zeroth, first, second, and third law of thermodynamics.

Zeroth law of thermodynamics: If two systems are each in thermal equilibrium with a third, they are also in thermal equilibrium with each other.

First law of thermodynamics: A change in the internal energy of a closed thermodynamic system is equal to the difference between the heat supplied to the system and the amount of work done by the system on its surroundings.

Second law of thermodynamics: Heat cannot spontaneously flow from a colder location to a hotter location.

Third law of thermodynamics: As a system approaches absolute zero, all processes cease and the entropy of the system approaches a minimum value.

Actually, to understand more simple about thermodynamics lets focus on the first and the second law of thermodynamics. If you have already read above about this law, you know that they have to do with energy, the first explicity, and the second emplicity.

The first law says that energy is conserved. That's all; you don't get something for nothing. The second law says that even within the framework of conservation, you can't have it just any way you might like it.

Related book:

If you want to understand thermodynamics with simply way, this book is the answer. Language is informal, examples are vivid and lively, and the perspectivie is fresh. Based on lectures delivered to engineering students, this work will also be valued by scientists, engineers, technicians, businessmen, and anyone else. But if you want to understand thermodynamics deeper, better if you use this book: Fundamentals of Engineering Thermodynamics. Even it's more expensive, this book maintains its engaging, readable style while presenting a broader range of applications that motivate student understanding of core thermodynamics concepts.

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Applied Thermodynamics

Applied thermodynamics is the science of the relationship between heat, work, and system that analyse energy process. The process is to convert heat energy from available source such as chemical fuels into mechanical work.

This fundamental science is the basic thermodynamics process that is used in the steam power plant. The related topics are:

1. Laws of thermodynamics (zeroth, first, and second law)
2. Definition of: energy, power, enthalpy, entropy, temperature, pressure, specific volume, density, sensible heat, latent heat, thermal conductivity, mass flow, heat engines, turbines, steam turbine, gas turbine, compressor, thermodynamic cycle, working fluid, ideal gas, system.
3. Definition of processes: isobaric, isothermal, isentropic, isometric, adiabatic.
4. Heat transfer: heat exchanger, condenser, heat flow through a pipe.

I'll explain each topics next, but if you want to know further detail of it, you may read this books:
Or this one:

Both book have advantage and disadvantage of each. The first book Dictionary of Engineering (Second Edition) is general for all engineering science include mechanical, civil, architech, ect. It has pronounciation guide for every term; acronyms, cross-references, and abbreviations; appendices with conversion tables; listings of scientific, technical, and mathematical notation; tables of relevant data; and more.

The other one, Dictionary of Mechanical Engineering, focuss only on mechanical engineering term. It is powerfull with the newest terms of mechanical engineering, include the rapidly advancing areas of 'small size' mechanical engineering: micromachining and nanotechnology.

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