According to Helmenstine (2017), "The triple point for water is at 0.01 Celsius at 4.56 mm Hg.

According to Helmenstine (2017), "The triple point for water is at 0.01° Celsius at 4.56 mm Hg. The triple point of water is a fixed quantity, used to define other triple point values and the kelvin unit of temperature."

QUESTION FROM THE PROFESSOR:

• At the triple point solid, liquid and gas can coexist?