What is significance of first law of thermodynamics ?

Explanation

To answer the question about the significance of the first law of thermodynamics, let's break it down step by step.

### Step-by-Step Solution:

1. **Understanding the First Law of Thermodynamics**:
- The first law of thermodynamics states that the total energy of an isolated system is constant. It can be expressed mathematically as:
\[
\Delta Q = \Delta U + \Delta W
...