Discussion
Which relationship connects the kelvin and Celsius scales?
Answer: A
The two scales have the same size of degree and differ only in their zero point, with 0 degrees Celsius equal to 273.15 kelvin. Absolute zero is therefore minus 273.15 degrees Celsius. The rounded value 273 is adequate for most purposes but the full figure should be used where precision matters, particularly in radiative calculations involving the fourth power of temperature. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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