Primary Word |
Secondary Word |
Definition |
Tutorial Page Link |

van der Waal's EOS | The original cubic EOS, the van der Waals EOS is not empirical in nature, but has a theoretical basis. The derivation of the van der Waals EOS yields two parameters that are functions of the critical temperature and pressure. One of the parameters accounts for the attractive forces between the molecules and the other parameter represents the volume that the molecules themselves occupy. | 2F1 , 4 , 5 , 6 | |

vapor | A species that is in the gas phase but is below its critical temperature. In practical terms, this means that if we could raise the pressure high enough, the vapor would condense. A vapor is said to be "condensable". | 2B2 | |

vapor | saturated | 2B2 , 4 , 5 , 6 , 8 | |

vapor | superheated | 2B2 , 4 | |

vapor compression refrigeration cycle | ideal | 10B2 , 3 | |

vapor compression refrigeration cycle | non-ideal | 10B4 | |

vapor pressure | The pressure that a pure liquid COULD overcome in order to boil. Vapor pressure depends on temperature only. If we keep the temperature constant and begin reducing the pressure starting from a very high pressure, then the vapor pressure at our fixed temperature is the pressure at which the liquid begins to boil (first bubble of vapor forms). [atm, Pa, bar,...] | 2B2 , 6, 2C2, 2D2 , 6 , 8 , 9 | |

vapor-compression refrigeration | cascade | 10C2 - 4 | |

vapor-compression refrigeration | cascade, COP of | 10C4 | |

vapor-compression refrigeration | multistage | 10C5 , 6 | |

vaporization | Vaporization is a general term that includes both boiling and evaporation. Vaporization is a process in which a molecule makes the transition from a liquid phase into the gas phase either by boiling or evaporation. | 2B7, 2D5, | |

vaporization | latent heat of | 3E2 - 13 | |

vaporize | 2D1 | ||

vapor-liquid equilibrium | 2B2, 2D1, | ||

vapor-liquid equilibrium curve | 2B8 | ||

velocity | 5A4 | ||

velocity profile | 5A4 | ||

velocity profile | average | 5A5 | |

velocity profile | parabolic | 5A4 | |

velocity profile | uniform | 5A4 | |

vibrational energy | The energy associated with the atoms of a polyatomic molecule vibrating about their common center of mass. This refers to the stretching, flexing and deformation the molecule and its bonds. | 2A4 | |

Virial coefficient | first | 2F2 , 3 | |

Virial coefficient | second | 2F2 , 3 | |

Virial EOS | The Virial EOS is a power series expansion in terms of the inverse of the molar volume. The parameters of the Virial EOS can be interpreted in terms of statistical mechanics. The 2nd Virial Coefficient, B, is widely tabulated and its value for a pure compound at a given temperature can be estimated using the critical temperature and pressure and the Pitzer Accentric Factor. | 2F1 - 3 | |

volume | [m^3] | 1D1 | |

volume | Ideal Critical Molar | The molar volume at of a pure substance predicted by the Ideal Gas EOS at the critical temperature and pressure of that substance. [ L/mol ] | 2E7 |

volume | Ideal Reduced Molar | The ratio of the molar volume of a substance to the ideal critical molar volume of the same substance. | 2E8 |

volume | Critical Molar | The molar volume at of a pure substance when it exists at the critical temperature and pressure of that substance. [ L/mol ] | 2E7 |

volume | molar | The total volume of a system divided by the number of moles in the system. [ L/mole , ft^3/lbmole ] | 1D1, 2B1, 2E1 |

volume | specific | The total volume of a system divided by the total mass in the system. [ m^3/kg , ft^3/lbm ] | 1D1, 2B1, 2C2 |

volumetric flow rate | 5A5, 5B8, | ||