COVERT NM3 ARGON TO KG

[HVAZIRI]

FOR CALCULATION OF PAYMENT I MUST CONVERT 1NM3 OF GASOUSE ARGON TO KG.

AND I dont know which factor i must use ( 15 deg. OR 20 deg. ).

PLEASE HELP ME FOR ACTUAL FACTOR FOR THIS CONVERT.

BEST REGARDS.

H VAZIRI