The triple point of water, defined at 273.16 K and a partial pressure of 611.73 Pa, serves as the SI base unit for thermodynamic temperature due to its unique reproducibility under specified conditions. Unlike the ice point and boiling point, which vary with pressure, the triple point remains constant, making it a reliable reference. This unique characteristic allows for accurate calibration of temperature probes, ensuring consistency across measurements. The discussion emphasizes the importance of pressure stability when determining temperature at the ice point, highlighting the advantages of using the triple point for standardization.
PREREQUISITESScientists, engineers, and educators in the fields of thermodynamics, metrology, and temperature measurement will benefit from this discussion, particularly those involved in standardizing temperature measurements and calibrating instruments.
gunparashar said:why triple point of water is used to define SI base unit of thermodynamic temperature even though for triple point we need to define both temperature (. 01) and pressure(partial pressure = 611.73 pa). this thing we can do with ice point and boiling point which is same when temperature and pressure is defined.