### Abstract

Measurements of the vapor-liquid coexistence curve near the critical point were carried out for 1,1,1-trifluoroethane (R-143a) in the reduced temperature range of 0.97 < T/T_{c} < 1 and in the reduced density range of 0.45 < ρ/ρ_{c} < 1.53. Taking into consideration of the disappearing level of the meniscus as well as the intensity of the critical opalescence, the critical temperature T_{c} and critical density ρ_{c} were determined. With respect to the critical pressure P_{c}, we calculated the value from the new vapor-pressure equation made by ourselves in order to represent the behavior of vapor-pressures near the critical point. The critical parameters determined in this paper are T_{c} = 345.88 + δ_{T} K, δ_{T} = 0.00±0.01 K, ρ_{c} = 431 ± 3 kg m^{-3}, and P_{c} = 3764 + 78.73δ_{T} ± 5 kPa. In addition, the critical exponent β along the coexistence curve was also discussed.

Original language | English |
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Pages (from-to) | 139-147 |

Number of pages | 9 |

Journal | Fluid Phase Equilibria |

Volume | 125 |

Issue number | 1-2 |

Publication status | Published - Oct 15 1996 |

Externally published | Yes |

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### All Science Journal Classification (ASJC) codes

- Chemical Engineering(all)
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry

### Cite this

*Fluid Phase Equilibria*,

*125*(1-2), 139-147.