Why is 273 called absolute zero?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
There's a common misconception here 273 is not absolute zero. Absolute zero is 0 Kelvin, which equals approximately -273°C (precisely -273.15°C). The number 273 appears in conversions because you add or subtract approximately 273 (precisely 273.15) when converting between Celsius and Kelvin scales.
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