Pkg.add("https://github.com/hzgzh/NatureGas.git")
julia>ng_zfactor(6,300;CO2=0.006,N2=0.003,CH4=0.965,C2H6=0.018,C3H8=0.0045,
iC4H10=0.001,nC4H10=0.001,iC5H12=0.0005,nC5H12=0.0003,nC6H14=0.0007))
0.8953514530758864
Pkg.add("https://github.com/hzgzh/NatureGas.git")
julia>ng_zfactor(6,300;CO2=0.006,N2=0.003,CH4=0.965,C2H6=0.018,C3H8=0.0045,
iC4H10=0.001,nC4H10=0.001,iC5H12=0.0005,nC5H12=0.0003,nC6H14=0.0007))
0.8953514530758864