The 'kelvin' and the celsius 'degree' are identical temperature intervals ... they are the same size. The marks on the kelvin thermometer and the marks on the celsius thermometer are the same distance apart. Both scales have 100 divisions between the freezing and boiling temperatures of water, but the scales start at different places. (Kelvin starts at 'absolute zero', celsius starts at the freezing temperature of water.) The graphs of these two scales are parallel lines. The graphs never intersect, meaning that there is no temperature where kelvin and celsius are the same number.
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One Kelvin degree represents the same difference in temperature as one Celsius degree.
0 Kelvin is -273.15 oCelsius. There is no negative portion on the Kelvin scale. 1 Kelvin degree has the same magnitude as 1 Celsius degree. If the temperature drops 15 K that is the same as dropping 15 oC Note Kelvin does not use the degree symbol.
A degree Celsius (which is also the same a a Kelvin).
A kelvin is larger. The kelvin "interval" is the same as a centigrade (celsius) degree
The size of the degree is the same in the Kelvin and Celsius scales.