What is the First law of thermodynamics so important?? and why is it so important?
The main reason why the first law of thermodynamics is so important is because it enforces the principle of conservation of total energy in a system. It states that -
'There exists a variable of state, the internal energy 𝐸. If a system is transformed from a state of equilibrium 𝐴 to another state 𝐵 by a process in which a certain amount of work 𝑊 is done by the surroundings, and a certain amount of heat 𝑄 being transferred from the surroundings, the difference in the internal energy of the systems is equal to the sum of 𝑄 and 𝑊'
Hope that answers your question!
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