# 19. Equation of State and Basic Thermodynamic Processes

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2016-02-04 19:35

## Section

1. An ideal gas is a gas that obeys all gas laws exactly2. An ideal gas can be compressed without limit because it is presumed that the molecules take up negligible space

## The Ideal Gas Equation

Question | Answer |
---|---|

p | Pressure (Pa) |

V | Volume (m^3) |

n | Amount of Sub. (mol) |

R | Universal Gas Constant (8.314J.K^-1) |

T | Absolute Temperature (K) |

This equation is only exact for the equilibrium state of an ideal gas.

To describe a real gas, there is the...

## van der Waals equation:

Question | Answer |
---|---|

p | Pressure (Pa) |

V | Volume (m^3) |

n | Amount of Sub. (mol) |

R | Universal Gas Constant (8.314J.K^-1) |

T | Absolute Temperature (K) |

a | empirical constant related to v.d.W forces between gas molecules |

b | empirical constant, volume of 1mol of gas in liquid state |

## There are 4 Thermodynamic Processes

Name | Characteristic | Connected Law |
---|---|---|

Isothermal | Temperature is constant. | Expressed by Boyle's Law p.V = Constant |

Isobaric | Pressure is constant. | Expressed by Gay-Lussac's Law V/T = Constant |

Isochoric | Volume is Constant. | Expressed by Gay-Lussac's law p/T = Constant |

Adiabatic | Entropy is constant. | System can't transfer heat with surroundings. p.V^k |

Question | Answer |
---|---|

K | Poisson's Constant, defined by ratio Cp/Cv from Mayers Equation |

Mayers Equation | Cp = Cv + R |

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