First law Thermodynamics equation [Mechanical engineering]

First law Thermodynamics equation

Thermodynamics is expressed by a mathematical framework of thermodynamic equations which relate various thermodynamic quantities and physical properties measured in a laboratory or production process. Thermodynamics is based on a fundamental set of postulates, that became the laws of thermodynamics.


One of the fundamental thermodynamic equations is the description of thermodynamic work in analogy to mechanical work, or weight lifted through an elevation against gravity, as defined in 1824 by French physicist Sadi Carnot. Carnot used the phrase motive power for work. In the footnotes to his famous On the Motive Power of Fire, he states: “We use here the expression motive power to express the useful effect that a motor is capable of producing. This effect can always be likened to the elevation of a weight to a certain height. It has, as we know, as a measure, the product of the weight multiplied by the height to which it is raised.” With the inclusion of a unit of time in Carnot's definition, one arrives at the modern definition for power:

You might also like
The first law of thermodynamics
The first law of thermodynamics
OAT: Thermodynamics & Thermochemistry Pt 2 – First Law
OAT: Thermodynamics & Thermochemistry Pt 2 – First Law ...
Ashish Kumar Heat and Mass Transfer
Mobile Application (Ashish Kumar)
  • This free application is for all students across the world. It covers 146 topics of Heat and Mass Transfer in detail. These 146 topics are divided in 5 units.
  • Each topic is around 600 words and is complete with diagrams, equations and other forms of graphical representations along with simple text explaining the concept...
  • This USP of this application is ultra-portability . Students can access the content on-the-go from anywhere they like.
  • Basically, each topic is like a detailed flash card and will make the lives of students simpler and easier.
  • Some of topics Covered in this application are:
  • 1. Concept of mechanism of heat flow
  • 2. Conduction
  • 3. Convection
  • 4. Radiation
  • 5. Relationship to the first law of thermodynamics
Related Posts