Explanation

The Kelvin (K) temperature scale is a scale of measurement for temperature that is based on the absolute zero point, which is defined as 0 K. The difference between the Kelvin and Celsius scales is that the Kelvin scale starts at absolute zero, while the Celsius scale starts at the freezing point of water.

To convert a temperature measured in degrees Celsius (°C) to Kelvin (K), you can use the following formula:

Temperature in Kelvin = Temperature in Celsius + 273.15

In your case, you want to convert -273°C to Kelvin, to do that you need to add 273.15 to -273,

-273 + 273.15 = 0

So -273 degrees Celsius is equivalent to 0 Kelvin.