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.

Explanation : 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 the second law of thermodynamics here.

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