Definition | Units | |
---|---|---|

a
| Radius of cylinder or sphere | cm |

β | Oxygen solubility | nmol cm^{–3} kPa^{–1} |

C
| Oxygen concentration | nmol cm^{–3} |

D
| Oxygen diffusion coefficient | cm^{2} s^{–1} |

k
| First-order reaction coefficient | s^{–1} |

K
| Krogh's coefficient of diffusion | nmol cm^{–1} s^{–1} kPa^{–1} |

K
_{m}
| Half-saturation (Michaelis) constant | nmol cm^{–3} |

l
| Half thickness of sheet | cm |

P
| Partial pressure of oxygen | kPa |

r
| Radial distance | cm |

t
| Time | s |

V
_{max}
| Maximum reaction rate at saturation | nmol cm^{–3} s^{–1} |

x
| Distance | cm |

τ | Approximate time to reach steady state | dimensionless |