text: This table lists the gas–liquid–solid triple points of several substances. Unless otherwise noted, the data come from the U.S. National Bureau of Standards (now NIST, National Institute of Standards and Technology).
  Notes:
  * For comparison, typical atmospheric pressure is 101.325 kPa (1 atm).
  * Before the new definition of SI units, water's triple point, 273.16 K, was an exact number.