Define absolute zero and absolute scale of temperature.
Write the relationship between `""^@C` and K.

Explanation

### Step-by-Step Solution

1. **Define Absolute Zero**:
- Absolute zero is the theoretical lowest temperature possible, where all molecular motion stops. It is defined as 0 Kelvin (K) or -273.15 degrees Celsius (°C).

2. **Define Absolute Scale of Temperature**:
- The absolute scale of temperature is the Kelvin scale. It is called the absolute scale because it starts at absolute zero, which is -273.15 °C. The Kelvin scale does not have negative values, and it is used in scientific contexts to measure temperature.

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