How can Celsius temperatures be converted to kelvins for gas-law calculations?

To convert temperatures from the Celsius scale to the Kelvin scale for use in gas-law calculations, you add 273.15 to the Celsius value.123

The formula is:
$$T(K)=t{(}^{\circ }\text{C})+273.15$$

This conversion is necessary because gas laws, such as the ideal gas law ($PV=nRT$) and Charles’s law, require the use of absolute thermodynamic temperature to accurately describe the behavior of a gas. Because the Kelvin degree is identical in size to the Celsius degree, this simple addition aligns the Celsius scale with the absolute zero point of the Kelvin scale, ensuring that all temperature values used in these equations are non-negative.4312