Question

Whycelsuis scale was earlier known as centigrade scale

Answer 1

The freezing point is taken as 0 degrees Celsius and the boiling point as 100 degrees Celsius. The Celsius scale is widely known as the centigrade scale because it is divided into 100 degrees. It is named for the Swedish astronomer Anders Celsius , who established the scale in 1742.

Answer 2

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☜☆☞ Well, degrees Kelvin are the same size as degrees Celsius - the only difference is an offset. 0 degrees Kelvin is about -273.16 degrees Celsius.

There is nothing analogous to negative degrees Kelvin, as (absolute) zero Kelvin is the temperature at which all molecular motion stops.

There are quite a few equations that use temperature in the formula, and they use degrees K or absolute temperature. In this context, I can explain how Kelvin is an absolute scale - while Celsius - not so much.

Well that could be 0→ 100C, 25 → 125K, -40 → 60C.

Now what is meant by a “doubling of absolute temperature” ?

25K → 50K ?  Yes 
10C → 20C ?  No - that would be an increase of 293.16/273.16 - a mere 7.3%.

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