The<unk> , named after Danish physician Christian<unk>  (1855–1911), describes the amount of physiological dead space in a person's lungs. This is given as a ratio of dead space to tidal volume. It differs from anatomical dead space as measured by Fowler's method as it includes alveolar dead space.
Bohr equation
Maxwell–Fricke equation
Shunt equation
Winters' formula
Paula method
Corbett's electrostatic machine
Mentzer index
Falconer's formula