Inertance
The inertance is a measure of Pneumology and called the inertia of the lungs and chest . It is hardly relevant in the clinical area.
Physical approach
In a simplified way, the inertance can be explained with the help of a pipe that contains a moving fluid . For example, air can be assumed as the fluid, which also directly connects to pneumology. If there is now ambient pressure at both openings of the pipe and therefore no pressure difference from one opening to the other, it is obvious that the fluid will not move. If you increase the pressure at an opening, e.g. B. when an inflated balloon is attached, the air will move in the direction of the other opening due to the pressure difference. At this moment, a flow forms in the pipe, which continues until the pressure difference is no longer present. In this example, this would be the case when the balloon is empty or is removed again.
From a physical point of view, the friction on the inner wall of the pipe and the inertia of the flowing medium, in this case the air, cause the movement to be delayed if there is a pressure difference at 2 openings. This means that a sudden pressure difference only leads to a flow after a certain time. This time can be increased in the z. B. the pipe is extended or the density is increased. A longer pipe contains more gas volume, which in turn requires more time before it starts to move due to the pressure difference. On the other hand, if you take a gas with a higher density, the mass of the gas to be moved increases.
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- ↑ Diagnostic relevance of pulse oscillometry in comparison to body plethysmography in childhood by Alexander Kraus, JMU Würzburg
