It doesn't "start at 0"; there are both negative and positive temperatures on the Centigrade scale.
The Absolute scale (degrees Kelvin) which starts at absolute 0. The Centigrade scale that starts at the freezing point of ice. The Fahrenheit scale that starts at the freezing point of brine.
On the Celsius, or Centigrade temperature scale, freezing is 0 (zero) degrees. On the Celsius, or Centigrade temperature scale, freezing is 0 (zero) degrees.
32 degrees Fahrenheit- the temperature at which water freezes.
Centigrade degrees or the "Celsius" scale.
Ice melts at 0 degrees Celsius on the Celsius scale.
0 degree centigrate
0 degrees C
Centigrade or Celsius Temperature Scale
273
Absolute zero ,-273 degrees centigrade approximately
It is based on units of ten, and the boiling point of water on the centigrade scale is 100 degrees. That's what centigrade means: Centi=100. Gradus=step or degree.
Celsius and Centigrade