Temperature cannot be expressed below `-273.15^@C`. This led to the need of Kelvin scale.

Explanation

### Step-by-Step Solution

1. **Understanding Absolute Zero**:
- The lowest possible temperature is defined as absolute zero, which is equivalent to -273.15°C. At this temperature, all molecular motion ceases.

2. **Introduction of the Kelvin Scale**:
- Since temperatures cannot be measured below -273.15°C, the Kelvin scale was developed. The Kelvin scale starts at absolute zero, making it a more useful scale for scientific calculations.

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