The triple point of water has been assigned a value of 273.16 K (0.01 °C; 32.02 °F) and a partial vapor pressure of 611.66 pascals (6.1166 mbar; 0.0060366 atm). At that point, it is possible to change all the substance to vapor, water, or ice by making arbitrarily small changes in pressure and temperature. Even if the total pressure is well above the triple point of water, provided that the partial pressure of the water vapor is 611.657 pascals, then the system can still be brought to the triple point of water.