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1.17.4 Definitions and Notations 
The density (“d”) of LNG loaded or notations unloaded at the prevailing composition 
and temperature T, in kg/m1, shall be rounded to 2 (two) decimal places and calculated 
as follows: 
d  =    
∑( X𝑖 * M𝑖)
∑( X𝑖 * V𝑖) −[𝐾1 + (𝐾2 −𝐾1)
0.0425
∗𝑋𝑛] ∗𝑋𝑚
    
 
Hi = Gross Calorific Value (Molar Based) of individual LNG components at 15C 
(fifteen degrees Celsius) and 1,013.25 millibars, in MJ/kg as specified in ISO 6976 (1995) 
and ISO 6578; 
 
Hm = Gross Calorific Value (Mass Based) of the liquid cargo loaded or unloaded 
in its gaseous state in MJ/m3(st), rounded to 2 (two) decimal places, calculated in 
accordance with the formula: 
𝐻𝑚  =    
∑( X𝑖 * M𝑖∗𝐻𝑖)
∑( X𝑖 * M𝑖)
    
 
Hv = Gross Calorific Value (Volumetric) of the liquid cargo loaded or unloaded in 
its gaseous state in MJ/m3(st) rounded to 2 (two) decimal places, calculated 
in accordance with the formula: 
𝐻𝑣  =    
∑( X𝑖 * M𝑖∗𝐻𝑖)
23.6449
    
 
 
Where 23.6449 is the volume occupied by a kmol of ideal gas at 15C (fifteen 
degrees Celsius) and an absolute pressure of 1.01325 bar; 
 
K1 = volume correction factor at temperature T, in m3/kmol, rounded to 6 (six) 
decimal places, obtained by linear interpolation; 
 
K2 = volume correction factor at temperature T, in m3/kmol rounded to 6 (six) 
decimal places, obtained by linear interpolation from Part III of Attachment 
4;