Schmid P, Schlick W, Irsigler K
Wien Klin Wochenschr. 1976 Jan 9;88(1):15-9.
A new method for determination of the specific weight of the gas-free human body is presented. Volume measurement is facilitated by extremely precise scales, by means of which a well-defined amount of water which was removed from a "patient container" is weighed. After the test subject has entered the container and is standing up to the neck in water, the container is closed. The combined gas volume consisting of the subject's lung volume, his intestinal gas and the air around his head is measured by lowering the pressure by an exactly-defined amount. This is done by opening a valve at the bottom of the container, which results in the outflow of a certain amount of water, the volume of which corresponds to the volume expansion inside the container. The gas volume prior to expansion can then be calculated by application of the gas laws. The advantages of this measuring device are its relatively small size, the high precision and the fact that the procedure is not unpleasant for the subject, as the head is not submerged under water.
本文提出了一种测定无气体人体比重的新方法。借助极其精确的秤便于进行体积测量，通过该秤对从“患者容器”中排出的一定量的水进行称重。在测试对象进入容器并在水中站立到颈部后，将容器关闭。通过将压力精确降低一定量来测量由受试者的肺容积、肠道气体和头部周围空气组成的混合气体体积。这是通过打开容器底部的阀门来实现的，这会导致一定量的水流出，其体积与容器内部的体积膨胀相对应。然后可以应用气体定律计算膨胀前的气体体积。这种测量装置的优点是其尺寸相对较小、精度高，并且该过程对受试者来说不会不舒服，因为头部不会浸没在水中。
