T0 | The temperature of the rod at x = 0 |

T(x) | The temperature of the rod as a function of x |

Tenv | The temperature of the air, room temperature |

Theta(x) | The "excess" of the temperature above room temperature. T(x) - Tenv |

SA | The cross sectional area |

C | The circumference of the rod |

k | The thermal conductivity of the material of the rod |

h | The surface coefficient of heat transfer between the rod and its environment |