| PSM 1 | |||
| Component | Symbol | Mole fraction | Uncertainty |
| Argon | Ar | 3.889 × 10−5 | 0.022 × 10−3 |
| Methane | CH4 | 98.505 × 10−2 | 0.250 × 10−4 |
| n-pentane | n-C5H12 | 5.056 × 10−3 | 0.014 × 10−3 |
| i-pentane | i-C5H12 | 5.046 × 10−3 | 0.014 × 10−3 |
| n-hexane | n-C6H14 | 4.805 × 10−3 | 0.013 × 10−3 |