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RE: On the trail of Heat (II)-- Understanding Heat transfer and the modes of propagation.
Interesting read. This brings to memory the days of high school physics
To answer your question, most times, the scales can be used interchangeably but I guess Celsius is used in this case because the very grassroots(absolute zero) in kelvin scale is just an ideal thing and not actually possible in real life situation. Celsius however offers negative values up to - 273.