"Centigrade" is a term which means 100 divisions. I can apply that term to anything measurable that I like.
OTOH, The SI Metric system uses the actual names of the people responsible for the definition of terms.
Hertz, Ampere, Curie, Volta and, of course Celsius, himself are a few examples.
Celsius proposed a simple centigrade temperature scale which used plain water as the standard.
At zero, it freezes, at 100, it boils. No infatuations with a bucket of salt at all.
It is an agreed-to fact that the values are defined at Mean Sea Level = 1 atm pressure.
OTOH, The SI Metric system uses the actual names of the people responsible for the definition of terms.
Hertz, Ampere, Curie, Volta and, of course Celsius, himself are a few examples.
Celsius proposed a simple centigrade temperature scale which used plain water as the standard.
At zero, it freezes, at 100, it boils. No infatuations with a bucket of salt at all.
It is an agreed-to fact that the values are defined at Mean Sea Level = 1 atm pressure.