What is the first law of thermodynamics?

First Law of Thermodynamics:

The first law of thermodynamics states that the amount of heat given to a system is equal to the sum of the increase in the internal energy of the system and the external work done.


When the whole of the work done is used in producing heat or vice versa then,

W = JH                       [J is the Joule’s mechanical equivalent of heat]

     δH = the quantity of heat
     δW = amount of external work done
     dU = the increase in internal energy.

Then, mathematically we can write,

δH = dU + δW

The above equation represents the first law of thermodynamics.

Read Next:
  1. Read the second law of thermodynamics here.

Author: Tanmay Chakrabarty

Tanmay Chakrabarty is a former CSE student, currently working as a Senior Software Engineer with 5+ years of experience in the field of Web Application development in PHP+MySQL platform with strong skills in Javascript, JQuery, JQuery UI and CSS. He tries to write notes every week but fails due to heavy loads of duty.

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