Express `-20^(@)C` in kelvin scale.

Answer

To convert the temperature from Celsius to Kelvin, we can use the formula:

\[ K = °C + 273.15 \]

Where:
- \( K \) is the temperature in Kelvin
- \( °C \) is the temperature in degrees Celsius

### Step-by-Step Solution:

1. **Identify the given temperature in Celsius**:
\[ °C = -20 \]

2. **Substitute the value into the conversion formula**:
\[ K = -20 + 273.15 \]

3. **Perform the addition**:
\[ K = 273.15 - 20 \]
\[ K = 253.15 \]

4. **Conclusion**:
The temperature of \(-20°C\) is equivalent to \(253.15 K\).

### Final Answer:
\[ -20°C = 253.15 K \]