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The two aren't numerically equal as there's a 273.15 difference between Celsius and Kelvin, but it'd probably be more useful if Kelvin were to be used as it's often compatible with many equations that involve temperature.
Celsius is always 273 units larger than Kelvin. However, they luckily have the same length of each unit. Consequently, since 0 Kelvin is defined by the temperature of absolute zero but 0 Celsius is defined by the temperature of ice-water mixture, they would never have the same numerical value for any temperature. If we are calculating difference in temperature, then there is no need to convert units. However, if we are multiplying temperature by something, then we have to use Kelvin unless specified by instructions to use other units, because Kelvin is included in international system of units.
Yes, like the others have said, you have to add 273.15 to the Celsius temperature to get Kelvin. This is really important for gas laws because the gas constant has units of Kelvin, so never forget to convert the temperature if it's in Celsius!
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