The correct option is K = °C + 273.15.
Explanation
The Kelvin (K) scale is the SI unit of thermodynamic temperature. Unlike the Celsius scale, which is based on the freezing and boiling points of water, the Kelvin scale is an absolute scale starting at absolute zero, the theoretical point where molecular motion ceases.
Detailed Analysis:
- Absolute Zero: The zero point on the Kelvin scale (0 K) corresponds to -273.15 °C.
- Scale Increment: The magnitude of one unit on the Kelvin scale is identical to the magnitude of one degree on the Celsius scale. Therefore, a change of 1 K is equivalent to a change of 1 °C.
- Conversion Formula: Since 0 K is equal to -273.15 °C, the temperature in Kelvin is obtained by adding 273.15 to the temperature in Celsius.
The mathematical relationship is expressed as:
K = °C + 273.15
Key Takeaway:
To convert temperature from the Celsius scale to the Kelvin scale, add 273.15 to the Celsius value. This relationship is fundamental in gas laws where temperature must always be expressed in Kelvin.