And Celsius first used the boiling point of water, and called that 100 degrees Celsius, and the freezing point of water and called that zero degrees Celsius.

定义一些参考点，例如摄氏温标定义水的沸点，是100摄氏度,冰点是0摄氏度。

麻省理工公开课 - 热力学与动力学课程节选