What are the reference points in thermometer with celsius scale?

The Celsius scale uses two main reference points based on water's properties:Primary reference points:- 0°C - Freezing point of water at standard atmospheric pressure- 100°C - Boiling point of water at standard atmospheric pressureOther important reference points:- -273.15°C - Absolute zero (theoretical lowest possible temperature)- 37°C - Normal human body temperature- 20-25°C - Typical room temperature- -40°C - Temperature where Celsius and Fahrenheit scales intersectThe Celsius scale was developed by Anders Celsius in 1742, originally with 0° as boiling point and 100° as freezing point, but was later reversed to the current format. These reference points make the scale practical for everyday use and scientific measurements.