Different temperature scales have different zero points.
The Celsius scale has the freezing point of water as zero degrees. The Fahrenheit has the freezing point of water at 32 degrees.
The Kelvin scale has it's zero point at the theoretical coldest temperature.
This is equivelent to (note the minus sign) -273.15 degrees Celsius. So the frezing point of water on the Kelvin scale would be (plus) 273.15 degrees Kelvin. Different scales are used for differing purposes.
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33 degrees Kelvin converts to -240.15 degrees Celsius; 55 degrees Kelvin converts to -218.15 degrees Celsius.
One Celsius is 274.15 degrees absolute (or K).
20 degrees Celsius = 293.15 kelvins
Answer: 68 ºF = 293 K
The conversion from Kelvin to Celsius is to subtract 273 degrees. Thus, 100 degrees Kelvin is -173 degrees Celsius.