Eli5 Why 80 degree Celsius is not four times as hot as 20 degrees celsius?

Question

Eli5 Why 80 degree Celsius is not four times as hot as 20 degrees celsius?

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Answer 1

Celsius has 100 degrees between the ice point (0 C, 32 F) and the steam point (100 C, 212 F).

Fahrenheit has 180 degrees between the same two points.

Those two points are 273.15 K and 373.15 K.

80 C is 353.15 K; 20 C is 293.15 K.