Blind sample number

Ⅰ

Ⅱ

Ⅲ

Ⅳ

p_pr

2.615

11.725

11.565

19.727

T_pr

1.34

1.85

1.79

1.94

Gas deviation coefficient

Experimental value

0.8242

1.2397

1.2224

1.5564

DAK

0.6744

1.2278

1.2236

1.6466

DPR

0.6737

1.2297

1.2249

1.6444

BB

0.6974

1.2424

1.2328

1.7670

HY

0.6756

1.2305

1.2270

1.6428

Improved Gopal

0.8291

1.2259

1.2128

1.5492

Relative

error/%

DAK

18.17

0.96

0.09

5.79

DPR

18.26

0.81

0.20

5.66

BB

15.39

0.21

0.85

313.53

HY

18.03

0.74

0.37

5.55

Improved Gopal

0.60

1.11

0.79

0.46