First law Thermodynamics definition [Mechanical engineering]

First law Thermodynamics definition

of-thermodynamics | Define Law-of-thermodynamics at

British Dictionary definitions for law-of-thermodynamics

law of thermodynamics

noun 1.

any of three principles governing the relationships between different forms of energy. The first law of thermodynamics (law of conservation of energy) states that the change in the internal energy of a system is equal to the sum of the heat added to the system and the work done on it. The second law of thermodynamics states that heat cannot be transferred from a colder to a hotter body within a system without net changes occurring in other bodies within that system; in any irreversible process, entropy always increases. The third law of thermodynamics (Nernst heat theorem) states that it is impossible to reduce the temperature of a system to absolute zero in a finite number of steps


Also called zeroth law of thermodynamics. the principle that if two bodies are each in thermal equilibrium with a third body then the first two bodies are in thermal equilibrium with each other

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source

You might also like
Definition of Process // Thermodynamics - Class 20
Definition of Process // Thermodynamics - Class 20
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
Chemistry,(Lec6,First Law of Thermo Dynamics
Chemistry,(Lec6,First Law of Thermo Dynamics ...
First law of thermodynamics
First law of thermodynamics
Related Posts