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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

Description of key information

Based on the data presented in discussion, the substance is fully gaseous at atmospheric pressure and 25°C. Thus, there can be no liquid/vapour equilibrium: vapour pressure does not apply.

Key value for chemical safety assessment

Additional information

The substance is fully gaseous at atmospheric pressure and 25°C because these conditions are well below the critical pressure (Pcr) and well above the critical temperatures (Tcr), of the three constituents making up for ~97% of its composition:

  • Carbon monoxide: Pcr 3.5 MPa and Tcr -140°C from two sources (Air Liquide. Gas Encyclopedia - CO. Available on-line at http://encyclopedia.airliquide.com/Encyclopedia.asp?GasID=45, consulted 05/20/2016) (O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 2006., p. 294).
  • Hydrogen: Pcr 1.3 MPa and Tcr -240°C from two sources (Air Liquide. Gas Encyclopedia - H2. Available on-line at http://encyclopedia.airliquide.com/Encyclopedia.asp?GasID=36, consulted 05/20/2016) (Budavari, S. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 1996., p. 821).
  • Nitrogen: Pcr 3.4 MPa and Tcr -147°C from two sources (Air Liquide. Gas Encyclopedia - N2. Available on-line at http://encyclopedia.airliquide.com/Encyclopedia.asp?GasID=5, consulted 05/20/2016) (O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Cambridge, UK: Royal Society of Chemistry, 2013., p. 1228).