Question

explanation for expression of first law of themodynamics ∆U=q+w​

Answer 1

Answer:

Explanation:

Let there be a system with a internal energy E1

Let we do work on it W1 ......1

Let heat dissipated or released Q1 ......2

By1 and 2

Internal enrgy is E2

So E2 = E1 + Q1 + WI

E2-E1 = Q1+W1

delta E = q+w

Hence first law of thermodynamics is proved

Answer 2

Explanation:

The First Law of Thermodynamics states that energy can be converted from one form to another with the interaction of heat, work and internal energy, but it cannot be created nor destroyed, under any circumstances. Mathematically, this is represented as

ΔU=q+w(1)

with

ΔU is the total change in internal energy of a system,

q is the heat exchanged between a system and its surroundings, and

w is the work done by or on the system

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