It's not clear what you mean by "Celsius in fa". Could you please rephrase your question?

For example, do you mean:

* Celsius to Fahrenheit conversion? If so, you can use the formula: F = (C × 9/5) + 32, where F is Fahrenheit and C is Celsius.

* Celsius as a unit of temperature? If so, it's simply a way of measuring temperature, with 0 degrees Celsius being the freezing point of water and 100 degrees Celsius being the boiling point.

* Something else entirely? Please provide more context!