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There are two conventions regarding the standard boiling point of water: The normal boiling point is commonly given as 100 °C (212 °F) (actually 99.97 °C (211.9 °F) following the thermodynamic definition of the Celsius scale based on the kelvin) at a pressure of 1 atm (101.325 kPa).
Values are in kelvin K and degrees Celsius °C, rounded ... Unless noted, all values refer to the normal boiling point at standard pressure (101.325 kPa). References
Boiling point (°C) K b (°C⋅kg/mol) Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] Lauric acid:
Freezing point of brine [a] 255.37 K 459.67 °Ra 0 °F −17.78 °C −14.224 °Ré Freezing point of water [b] 273.15 K 491.67 °Ra 32 °F 0 °C 0 °Ré Boiling point of water [c] 373.1339 K 671.64102 °Ra 211.97102 °F 99.9839 °C: 79.98712 °Ré
Also agrees with Celsius values from Section 4: Properties of the Elements and Inorganic Compounds, Melting, Boiling, Triple, and Critical Point Temperatures of the Elements Estimated accuracy for T c and P c is indicated by the number of digits.
If the system is divided by a wall that is permeable to heat or to matter, the temperature of each subsystem is identical. Additionally, the boiling temperature of a substance is an intensive property. For example, the boiling temperature of water is 100 °C at a pressure of one atmosphere, regardless of the quantity of water remaining as liquid.
Values refer to the enthalpy change in the conversion of liquid to gas at the boiling point (normal, 101.325 kPa). References
Note that the boiling point of 100.0 °C is at a pressure of 0.101325 MPa (1 atm), which is the average atmospheric pressure. Water/steam data table at standard pressure (0.1 M Pa ) T °C