1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Specific Gravity of LNG

  1. Dec 14, 2009 #1
    Hi Everyone...

    I'm trying to calculate the specific gravity of a sample of LNG using a compostion certificate and temperature and pressure variables of 5 bar at -134 deg C saturated. Its do perform a check for the value used to calculate how much is charged per litre by converting density to litres. The density should be around 0.4 kg/m^3 but i cant seem to get a close answer to that using the ideal gas equation, pv = nrt.

    Infor on composition certificate;
    Gas composition;
    Nitrogen ; 1.18%
    Methane; 96.66%

    Gas density at 15 deg C = 0.699 k/m^3
    Ave MW = 16.487 g/mol

    Can someone please help? thanks.
  2. jcsd
  3. Dec 15, 2009 #2


    User Avatar

    Staff: Mentor

    pV=nRT is and ideal GAS equation, LNG is a LIQUEFIED natural gas. You can't use theory that describes gaseous state to liquid state.

  4. Dec 15, 2009 #3
    Any suggestions to which way i should approach it then? cheers.
  5. Dec 15, 2009 #4


    User Avatar

    Staff: Mentor

    Only approach I can think of is to find density tables for LNG, engineering handbooks should have these. There are no theoretical equations that would allow calculation of density of a liquid (and even when such equations exist, they make heavy use of experimentally determined coefficients - so we are back to the handbook and tables).

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Specific Gravity of LNG
  1. Specific Heat (Replies: 5)

  2. Specific rotation (Replies: 3)

  3. Specific Heat (Replies: 3)